[FEATURE] CDK deploy automation with GitHub

[prudhvigodithi]

Is your feature request related to a problem?

Today with the code change the CDK stacks https://github.com/opensearch-project/opensearch-metrics/blob/main/DEVELOPER_GUIDE.md are manually deployed filling the section https://github.com/opensearch-project/opensearch-metrics/blob/main/infrastructure/lib/enums/project.ts.

What solution would you like?

Automate this upon merge to main, have an approval workflow to see the CDK changelog and approve if everything looks good.

Do you have any additional context?

Add any other context or screenshots about the feature request here.

[gaiksaya]

Example of CDK deployments using GHA https://github.com/opensearch-project/opensearch-devops/blob/main/.github/workflows/nightly-playground-deploy.yml