[viewannotation] Add get annotations list api MAPSAND-463

[ank27]

Summary of changes

Introduce view annotation ViewAnnotationManager.annotations API to access list of added view annotations.

User impact (optional)

Pull request checklist:

• [x] Briefly describe the changes in this PR.
• [ ] Include before/after visuals or gifs if this PR includes visual changes.
• [ ] Write tests for all new functionality. If tests were not written, please explain why.
• [ ] Optimize code for java consumption (@JvmOverloads, @file:JvmName, etc).
• [ ] Add example if relevant.
• [ ] Document any changes to public APIs.
• [ ] Run make update-api to update generated api files, if there's public API changes, otherwise the verify-api-* CI steps might fail.
• [ ] Update CHANGELOG.md or use the label 'skip changelog', otherwise check changelog CI step will fail.
• [x] If this PR is a v10.10 release branch fix / enhancement, merge it to main firstly and then port to v10.10 release branch.

Fixes: < Link to related issues that will be fixed by this pull request, if they exist >

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