Alerting: Contact point schema based packing/unpacking (#2330)

* Improve test coverage

* Support automated packing of nested schemas

Previously schema packing was manual for both non-sensitive and sensitive fields.
Sensitive fields were enumerated in `secureFields` and non-sensitive fields were packed/unpacked individually in their respective methods.

This change creates functions packNotifier/unpackNotifier which packs and unpacks state according to the given schema. This should reduce maintenance burden keeping them in sync and allows the exceptions (ex. field aliases and type conversions) to be the sole purpose of the custom notifier pack/unpack methods.

Only added to webhook for now.

* Convert other notifiers to new pack/unpack logic and cleanup

* Simplify redundant packing/unpacking logic

* Remove support for nested schema packing/unpacking

Since it's not used by anything yet, will add back when
those new fields are introduced

* Address PR comments

Author: JacobsonMT

examples/resources/grafana_contact_point/_acc_receiver_types.tf

@@ -106,6 +106,21 @@ resource "grafana_contact_point" "receiver_types" {
     message   = "message"
   }
 
+  slack {
+    endpoint_url    = "http://custom-slack-endpoint"
+    url             = "http://custom-slack-url"
+    recipient       = "#channel"
+    text            = "message"
+    title           = "title"
+    username        = "bot"
+    icon_emoji      = ":icon:"
+    icon_url        = "http://domain/icon.png"
+    mention_channel = "here"
+    mention_users   = "user"
+    mention_groups  = "group"
+    color           = "color"
+  }
+
   slack {
     endpoint_url    = "http://custom-slack-url"
     token           = "xoxb-token"
@@ -169,12 +184,6 @@ resource "grafana_contact_point" "receiver_types" {
     max_alerts          = 100
     message             = "Custom message"
     title               = "Custom title"
-    tls_config = {
-      insecure_skip_verify = true
-      ca_certificate       = "ca.crt"
-      client_certificate   = "client.crt"
-      client_key           = "client.key"
-    }
   }
 
   wecom {

examples/resources/grafana_contact_point/_acc_receiver_types_10_2.tf

@@ -10,4 +10,13 @@ resource "grafana_contact_point" "receiver_types" {
     message             = "Custom message"
     title               = "Custom title"
   }
+  oncall {
+    url                       = "http://my-url"
+    http_method               = "POST"
+    authorization_scheme      = "Basic"
+    authorization_credentials = "dXNlcjpwYXNzd29yZA=="
+    max_alerts                = 100
+    message                   = "Custom message"
+    title                     = "Custom title"
+  }
 }

examples/resources/grafana_contact_point/_acc_receiver_types_11_4.tf

@@ -0,0 +1,35 @@
+resource "grafana_contact_point" "receiver_types" {
+  name = "Receiver Types since v11.4"
+
+  webhook {
+    url                 = "http://my-url"
+    http_method         = "POST"
+    basic_auth_user     = "user"
+    basic_auth_password = "password"
+    max_alerts          = 100
+    message             = "Custom message"
+    title               = "Custom title"
+    tls_config = {
+      insecure_skip_verify = true
+      ca_certificate       = "ca.crt"
+      client_certificate   = "client.crt"
+      client_key           = "client.key"
+    }
+  }
+
+  webhook {
+    url                       = "http://my-url"
+    http_method               = "POST"
+    authorization_scheme      = "Basic"
+    authorization_credentials = "dXNlcjpwYXNzd29yZA=="
+    max_alerts                = 100
+    message                   = "Custom message"
+    title                     = "Custom title"
+    tls_config = {
+      insecure_skip_verify = true
+      ca_certificate       = "ca.crt"
+      client_certificate   = "client.crt"
+      client_key           = "client.key"
+    }
+  }
+}

examples/resources/grafana_contact_point/_acc_receiver_types_9_3.tf

@@ -0,0 +1,11 @@
+resource "grafana_contact_point" "receiver_types" {
+  name = "Receiver Types since v9.3"
+
+  victorops {
+    url          = "http://victor-ops-url"
+    message_type = "CRITICAL"
+    title        = "title"
+    description  = "description"
+  }
+
+}

examples/resources/grafana_contact_point/_acc_receiver_types_minimal.tf

@@ -0,0 +1,101 @@
+resource "grafana_contact_point" "minimal_receivers" {
+  name = "Minimal Receivers"
+
+  alertmanager {
+    url = "http://my-am"
+  }
+
+  dingding {
+    url = "http://dingding-url"
+  }
+
+  discord {
+    url = "http://discord-url"
+  }
+
+  email {
+    addresses = ["[email protected]", "[email protected]"]
+  }
+
+  googlechat {
+    url = "http://googlechat-url"
+  }
+
+  kafka {
+    rest_proxy_url = "http://kafka-rest-proxy-url"
+    topic          = "mytopic"
+  }
+
+  line {
+    token = "token"
+  }
+
+  oncall {
+    url = "http://oncall-url"
+  }
+
+  opsgenie {
+    api_key = "token"
+  }
+
+  pagerduty {
+    integration_key = "token"
+  }
+
+  pushover {
+    user_key  = "userkey"
+    api_token = "token"
+  }
+
+  sensugo {
+    url     = "http://sensugo-url"
+    api_key = "key"
+  }
+
+  slack {
+    token     = "xoxb-token"
+    recipient = "#channel"
+  }
+
+  slack {
+    url = "http://custom-slack-url"
+  }
+
+  teams {
+    url = "http://teams-webhook"
+  }
+
+  telegram {
+    token   = "token"
+    chat_id = "chat-id"
+  }
+
+  threema {
+    gateway_id   = "*gateway"
+    recipient_id = "*target1"
+    api_secret   = "secret"
+  }
+
+  victorops {
+    url = "http://victor-ops-url"
+  }
+
+  webex {
+    token   = "token"
+    room_id = "room_id"
+  }
+
+  webhook {
+    url = "http://webhook-url"
+  }
+
+  wecom {
+    url = "http://wecom-url"
+  }
+
+  wecom {
+    secret   = "secret"
+    corp_id  = "corp_id"
+    agent_id = "agent_id"
+  }
+}