Extensibility support email provider

[kushalshit27]

🔧 Changes

• Add default credentials support for Azure and MS365 email providers
• Update to auth0 4.16.0 Bump auth0 from 4.15.0 to 4.16.0 #1015

📚 References

• https://auth0.com/docs/api/management/v2/emails/get-provider
• https://auth0.com/docs/api/management/v2/emails/post-provider
• delete email provider

🔬 Testing

• Test pass ✅

📝 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

Attention: Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.

Project coverage is 80.10%. Comparing base (ee9e231) to head (ebe8ad1).
Report is 73 commits behind head on master.

Files with missing lines	Patch %	Lines
src/context/defaults.ts	0.00%	4 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1016      +/-   ##
==========================================
- Coverage   80.20%   80.10%   -0.11%     
==========================================
  Files         125      125              
  Lines        4562     4568       +6     
  Branches      884      888       +4     
==========================================
  Hits         3659     3659              
- Misses        535      539       +4     
- Partials      368      370       +2     

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