add client packages

[dprotaso]

Commits

• git add tools for generating clientset, informers, and listers
• drop manual registration and annotate k8s crds types
• add make targets to generate clients
• wire client gen into make generate call
• annotate EnvoyGateway

What type of PR is this?

• "feat(client): add new feature"

What this PR does / why we need it:
This adds client sets allowing end-users to create envoy gateway resources programmatically.

Which issue(s) this PR fixes:

Fixes None

Release Notes: No

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 696 lines in your changes missing coverage. Please review.

Project coverage is 65.43%. Comparing base (d50be42) to head (7b2200c).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/informers/externalversions/factory.go	0.00%	102 Missing ⚠️
...ientset/versioned/typed/api/v1alpha1/api_client.go	0.00%	58 Missing ⚠️
pkg/clientset/versioned/clientset.go	0.00%	47 Missing ⚠️
...kg/clientset/versioned/fake/clientset_generated.go	0.00%	23 Missing ⚠️
pkg/informers/externalversions/generic.go	0.00%	23 Missing ⚠️
...informers/externalversions/api/v1alpha1/backend.go	0.00%	21 Missing ⚠️
...ernalversions/api/v1alpha1/backendtrafficpolicy.go	0.00%	21 Missing ⚠️
...ternalversions/api/v1alpha1/clienttrafficpolicy.go	0.00%	21 Missing ⚠️
...ernalversions/api/v1alpha1/envoyextensionpolicy.go	0.00%	21 Missing ⚠️
.../externalversions/api/v1alpha1/envoypatchpolicy.go	0.00%	21 Missing ⚠️
... and 32 more

❌ Your patch check has failed because the patch coverage (0.00%) is below the target coverage (60.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5206      +/-   ##
==========================================
- Coverage   66.88%   65.43%   -1.45%     
==========================================
  Files         210      243      +33     
  Lines       32998    33676     +678     
==========================================
- Hits        22070    22037      -33     
- Misses       9589    10296     +707     
- Partials     1339     1343       +4     

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