Support parameterization at the gRPC level

[iwahbe]

This PR adds basic support for provider parameterization.

[codecov]

Codecov Report

Attention: Patch coverage is 80.00000% with 6 lines in your changes missing coverage. Please review.

Project coverage is 69.23%. Comparing base (9378ea6) to head (42cdc58).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
provider.go	80.00%	4 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #281      +/-   ##
==========================================
- Coverage   70.33%   69.23%   -1.11%     
==========================================
  Files          37       37              
  Lines        4214     5109     +895     
==========================================
+ Hits         2964     3537     +573     
- Misses        983     1304     +321     
- Partials      267      268       +1     

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[t0yv0]

I've been curious so I searched - https://pulumi-developer-docs.readthedocs.io/latest/docs/architecture/providers.html#parameterized-providers does a much better treatment of this then the doc comments, linking to end to end use cases. Perhaps drop a link here and keep comments especially for elucidating how the go-provider specific things help the user accomplish what's needed?

[t0yv0]

This needs acceptance tests, otherwise LGTM.

[pulumi-bot]

This PR has been shipped in release v0.24.0.