Allow snake case for binding names

[satvu]

Issue describing the changes in this PR

resolves #9917. Allows for binding names to use snake case.

Related documentation issue: #10781

Pull request checklist

IMPORTANT: Currently, changes must be backported to the in-proc branch to be included in Core Tools and non-Flex deployments.

• Backporting to the in-proc branch is not required
  • Otherwise: Link to backporting PR
• My changes do not require documentation changes
  • Otherwise: Documentation issue linked to PR
• My changes should not be added to the release notes for the next release
  • Otherwise: I've added my notes to release_notes.md
• My changes do not need to be backported to a previous version
  • Otherwise: Backport tracked by issue/PR #issue_or_pr
• My changes do not require diagnostic events changes
  • Otherwise: I have added/updated all related diagnostic events and their documentation (Documentation issue linked to PR)
• I have added all required tests (Unit tests, E2E tests)

Additional information

Additional tests were run on the Python side for v1 and v2 here as well.

Additional sign-offs were acquired offline from other language worker owners (Powershell, Java, Node).

[mathewc]

Please link to the relevant work items for this, and also fill out the template section above with all the details, etc.