grpc changes, model conversion, validation

[grokspawn]

Description of the change:
Contributes to #1154

NB: this is declarativeconfig --> grpc path only, right now. We need future issues for

• backwards conversions to support round trip: grpc api-->declarativeconfig types conversions #1162
• some unit tests specific to deprecation representation: GRPC deprecation utests #1163

Motivation for the change:

Reviewer Checklist

• Implementation matches the proposed design, or proposal is updated to match implementation
• Sufficient unit test coverage
• Sufficient end-to-end test coverage
• Docs updated or added to /docs
• Commit messages sensible and descriptive

[codecov]

Codecov Report

Attention: 114 lines in your changes are missing coverage. Please review.

Comparison is base (f2285a2) 53.76% compared to head (26a9f82) 53.32%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1161      +/-   ##
==========================================
- Coverage   53.76%   53.32%   -0.45%     
==========================================
  Files         108      108              
  Lines       10237    10337     +100     
==========================================
+ Hits         5504     5512       +8     
- Misses       3755     3841      +86     
- Partials      978      984       +6     

Files	Coverage Δ
alpha/declcfg/declcfg.go	82.60% <ø> (ø)
alpha/declcfg/write.go	67.58% <ø> (+0.79%)	⬆️
pkg/registry/types.go	29.21% <ø> (ø)
pkg/api/model_to_api.go	48.85% <40.00%> (-0.36%)	⬇️
pkg/cache/pkgs.go	72.72% <71.42%> (-1.77%)	⬇️
alpha/model/model.go	88.34% <18.18%> (-5.08%)	⬇️
pkg/registry/conversion.go	35.29% <0.00%> (-8.61%)	⬇️
pkg/api/registry_grpc.pb.go	0.00% <0.00%> (ø)
alpha/declcfg/declcfg_to_model.go	71.72% <15.00%> (-21.92%)	⬇️
pkg/api/registry.pb.go	2.81% <2.63%> (-0.17%)	⬇️

... and 1 file with indirect coverage changes

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[joelanford]

I think this looks good to me implementation-wise. What are you thinking re: tests?

[grokspawn]

I think this looks good to me implementation-wise. What are you thinking re: tests?

Tracked in #1163

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: everettraven, grokspawn

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• OWNERS [grokspawn]

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[joelanford]

/lgtm