Allow client grant scopes to be sent as an empty array

[sergiught]

🔧 Changes

This PR allows client grant scopes to be sent as an empty array by turning the field into a pointer.

📚 References

• Mismatch between arguments for auth0_client_grant  terraform-provider-auth0#884

🔬 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

All modified and coverable lines are covered by tests ✅

Comparison is base (9638ef4) 95.18% compared to head (89db961) 95.18%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #318   +/-   ##
=======================================
  Coverage   95.18%   95.18%           
=======================================
  Files          46       46           
  Lines        8951     8956    +5     
=======================================
+ Hits         8520     8525    +5     
  Misses        329      329           
  Partials      102      102           

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[caleygoff-invitae]

<3 thank you for merging this!