feat: add otp_settings support for database connections

[ankita10119]

🔧 Changes

Adds support for otp_settings on database connections (strategy: auth0), allowing configuration of OTP length and expiry per delivery channel (email and phone).

otp_settings is accepted and returned by the Management API only on strategy: auth0 connections. The property passes through deploy-cli without any special import/export handling, partial updates (e.g. setting only email.otp_length) are supported natively by the API's PATCH endpoint.

Note: The auth0 SDK version bump to 6.4.0 is tracked in a separate PR. otp_settings is not yet explicitly typed in the SDK, but ConnectionOptionsAuth0 carries [key: string]: any so the Fern serializer passes it through at runtime, import and export work end-to-end today.

📚 References

🔬 Testing

• Unit tests added for schema validation and export round-trip, all passing
• E2E tested against a real tenant: export → import with updated otp_expiry values → re-export confirmed values persisted correctly

📝 Checklist

• All new/changed/fixed functionality is covered by tests (or N/A)
• I have added documentation for all new/changed functionality (or N/A)

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.81%. Comparing base (4955e4b) to head (5e7263f).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1481   +/-   ##
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  Coverage   80.81%   80.81%           
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  Files         163      163           
  Lines        7805     7805           
  Branches     1741     1741           
=======================================
  Hits         6308     6308           
  Misses        797      797           
  Partials      700      700           

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