feat: add `zone_record` resource

[jooola]

Closes #1221

[jooola]

On hold until we decided whether the API receives a new endpoint to support this resource.

[codecov[bot]]

Codecov Report

:x: Patch coverage is 30.62016% with 179 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 36.27%. Comparing base (854b0e7) to head (a00edca).

Files with missing lines	Patch %	Lines
internal/zonerecord/resource.go	33.65%	136 Missing :warning:
internal/zonerecord/model.go	19.14%	37 Missing and 1 partial :warning:
internal/util/convutil/conv.go	0.00%	5 Missing :warning:

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1228       +/-   ##
===========================================
- Coverage   71.14%   36.27%   -34.88%     
===========================================
  Files          86       89        +3     
  Lines        9815    10073      +258     
===========================================
- Hits         6983     3654     -3329     
- Misses       1998     6371     +4373     
+ Partials      834       48      -786     

Flag	Coverage Δ
e2e	?
unit	36.27% <30.62%> (-0.15%)	:arrow_down:

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