add feature gates support in Helm templates

[eadasiak]

Issue #, if available: N/A, but related to aws-controllers-k8s/runtime#151

Description of changes: Adds optional support for feature gates in Helm templates. A top-level key of featureGates has been added to the default values file template, and the optional command-line argument has been appended to the deployment template.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[ack-prow]

Hi @eadasiak. Thanks for your PR.

I'm waiting for a aws-controllers-k8s member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[acornett21]

I'm not sure if the intent is two PR's, one for helm and one for manifests, but my personal preference is to see any flags added to the runtime, to be in one PR in the code-gen for all deployment types.

[michaelhtm]

/ok-to-test

[a-hilaly]

/retest

[acornett21]

All tests fail for the same reason

Error: INSTALLATION FAILED: parse error at (apigatewayv2-chart/templates/deployment.yaml:199): unexpected EOF

so whatever is rendered out for the deployment at line 199 is incorrect.

[eadasiak]

I think I see the issue -- an artifact from local testing. Will submit a revision in just a sec...

[a-hilaly]

Thank you so much @eadasiak !!

Tested locally with a dry run helm using:

featureGates:
  ReadOnlyResources: true
  FeatureXYZ: false

Works like a charm~

[a-hilaly]

/lgtm

[ack-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: a-hilaly, eadasiak

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