notify view change to vtgate

[harshit-gangal]

Description

This PR adds logic to track views definition changes in vttablet and notify through health stream response.

Related Issue(s)

• RFC: View Support #11559

Checklist

• Tests were added or are not required
• Documentation was added or is not required

Deployment Notes

[vitess-bot]

Review Checklist

Hello reviewers! 👋 Please follow this checklist when reviewing this Pull Request.

General

• Ensure that the Pull Request has a descriptive title.
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[GuptaManan100]

LGTM