pkg/lib/bundle/generate.go: add JSON tag to AnnotationMetadata

[estroz]

Description of the change: add a `json` tag to AnnotationMetadata

Motivation for the change: some YAML parsing libraries use JSON under the hood. This change allows both direct and indirect YAML parsers to understand AnnotationMetadata.

See operator-framework/operator-sdk#3120 (comment) for why this is a nice-to-have.

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

[estroz]

Didn't see that this struct is available in the api library. Closing. These are not the same struct, whoops. This PR is still necessary.

[estroz]

/retest

[Bowenislandsong]

/lgtm

[ecordell]

/approve

[dinhxuanvu]

/lgtm

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dinhxuanvu, ecordell, estroz

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [dinhxuanvu,ecordell]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[estroz]

/test unit