feat: update Identity Insights package for GA

[alnacle]

This PR update the Identity Insights package according to the GA release:

• New endpoint
• Update version to /v1
• Update Insights table in the README file

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.