feat: get secrets by versionId or versionStage (#27)

[ThirdEyeSqueegee]

Issue #, if available:
#27

Description of changes:

• Add optional versionId and versionStage args to GetSecretString and GetSecretBinary to allow retrieving secrets by version ID or version stage

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 90.90909% with 1 line in your changes missing coverage. Please review.

Project coverage is 73.00%. Comparing base (befeea6) to head (7e4dc58).
Report is 5 commits behind head on master.

Files with missing lines	Patch %	Lines
...cretsManager.Extensions.Caching/SecretCacheItem.cs	83.33%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #168      +/-   ##
==========================================
+ Coverage   72.52%   73.00%   +0.48%     
==========================================
  Files           6        6              
  Lines         222      226       +4     
  Branches       23       24       +1     
==========================================
+ Hits          161      165       +4     
  Misses         52       52              
  Partials        9        9              

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