Add metadata checks as part of PR Gate

[timayabi2020]

This task aims to detect metadata changes that may introduce breaking changes on existing cmdlets. This will entail the following activities.

• [ ] Detect URI changes in generated cmdlets metadata.
• [ ] Add list of path properties to cmdlet metadata and use it for detecting any changes i.e. Omissions/Deletions.
• [ ] Add operation Ids to cmdlet metadata and use it for detecting any changes i.e. Omissions/Deletions.

The above steps will take place in the existing build pipelines and alerts/warnings will be available in the event there are any changes.