Enhances Pbt usage experience through small improvements

[ooctipus]

Description

This PR is added with feedback from PBT user, and made below improvments

1. added resume logic to allow wandb to continue on the same run_id
2. corrected broadcasting order in distributed setup
3. made score query general by using dotted keys to access dictionary of arbitrary depth

Fixes # (issue)

• Bug fix (non-breaking change which fixes an issue)

Screenshots

Please attach before and after screenshots of the change if applicable.

Checklist

• I have read and understood the contribution guidelines
• I have run the pre-commit checks with ./isaaclab.sh --format
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• [] I have added tests that prove my fix is effective or that my feature works
• I have updated the changelog and the corresponding version in the extension's config/extension.toml file
• I have added my name to the CONTRIBUTORS.md or my name already exists there