Add declarative config support for setting schema url

[jack-berg]

See Resource.schema_url

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.17%. Comparing base (8126573) to head (55734a9).

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #8028   +/-   ##
=========================================
  Coverage     90.16%   90.17%           
- Complexity     7484     7485    +1     
=========================================
  Files           836      836           
  Lines         22562    22564    +2     
  Branches       2237     2238    +1     
=========================================
+ Hits          20344    20346    +2     
  Misses         1515     1515           
  Partials        703      703           

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