[1/4] Add validation to auth0_email attributes

[sergiught]

🔧 Changes

This change is mostly just to be more inline with the API validation so we can alert our users earlier of any issues.

📚 References

🔬 Testing

📝 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

Base: 86.74% // Head: 86.76% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (a8cadec) compared to base (eeffc4b).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #391      +/-   ##
==========================================
+ Coverage   86.74%   86.76%   +0.01%     
==========================================
  Files          41       41              
  Lines        8730     8742      +12     
==========================================
+ Hits         7573     7585      +12     
  Misses        890      890              
  Partials      267      267              

Impacted Files	Coverage Δ
internal/provider/resource_auth0_email.go	91.17% <100.00%> (+0.55%)	⬆️

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