Add a Client abstraction

[mikhailshilkov]

Adds another client layer around Cloud Control operations to encapsulate serialization, error handling, and awaiting long-running operations.

No functional changes.

[github-actions]

Does the PR have any schema changes?

Looking good! No breaking changes found.
No new resources/functions.

[codecov]

Codecov Report

Attention: Patch coverage is 32.85714% with 47 lines in your changes are missing coverage. Please review.

Project coverage is 23.80%. Comparing base (28f60c2) to head (968e815).
Report is 2 commits behind head on master.

Files	Patch %	Lines
provider/pkg/provider/client/client.go	31.57%	32 Missing and 7 partials ⚠️
provider/pkg/provider/provider.go	38.46%	6 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1416      +/-   ##
==========================================
+ Coverage   23.76%   23.80%   +0.04%     
==========================================
  Files          27       28       +1     
  Lines        4237     4259      +22     
==========================================
+ Hits         1007     1014       +7     
- Misses       3064     3077      +13     
- Partials      166      168       +2     

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[danielrbradley]

The shape of the client looks good. Just a question on how we're handling the partial create case.

[thomas11]

nice!