[CECO-1860][DatadogGenericResource](refactor 2) Add monitor support

[tbavelier]

What does this PR do?

Same as #1635 but for the "refactor" part 2 #1640

Motivation

What inspired you to submit this pull request?

Additional Notes

Anything else we should know when reviewing?

Minimum Agent Versions

Are there minimum versions of the Datadog Agent and/or Cluster Agent required?

• Agent: vX.Y.Z
• Cluster Agent: vX.Y.Z

Describe your test plan

Write there any instructions and details you may have to test your PR.

Checklist

• PR has at least one valid label: bug, enhancement, refactoring, documentation, tooling, and/or dependencies
• PR has a milestone or the qa/skip-qa label

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 73 lines in your changes missing coverage. Please review.

Project coverage is 49.15%. Comparing base (fc444c5) to head (618a5df).

Files with missing lines	Patch %	Lines
...rnal/controller/datadoggenericresource/monitors.go	0.00%	55 Missing ⚠️
pkg/datadogclient/client.go	0.00%	7 Missing ⚠️
...nternal/controller/datadoggenericresource/utils.go	0.00%	6 Missing ⚠️
...al/controller/datadoggenericresource/controller.go	0.00%	5 Missing ⚠️

Additional details and impacted files

@@                            Coverage Diff                             @@
##           tbavelier/generic_resource_re_refactor    #1641      +/-   ##
==========================================================================
- Coverage                                   49.53%   49.15%   -0.39%     
==========================================================================
  Files                                         218      219       +1     
  Lines                                       21320    21248      -72     
==========================================================================
- Hits                                        10561    10444     -117     
- Misses                                      10209    10259      +50     
+ Partials                                      550      545       -5     

Flag	Coverage Δ
unittests	49.15% <0.00%> (-0.39%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...al/controller/datadoggenericresource/controller.go	39.25% <0.00%> (+0.28%)	⬆️
...nternal/controller/datadoggenericresource/utils.go	50.45% <0.00%> (-2.94%)	⬇️
pkg/datadogclient/client.go	0.00% <0.00%> (ø)
...rnal/controller/datadoggenericresource/monitors.go	0.00% <0.00%> (ø)

... and 1 file with indirect coverage changes

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