feat: Generate sam sync schema

[Leo10Gama]

With this change, the schema for sam sync will be added to the JSON schema. It will serve to validate the parameters in samconfig for the sync command.

Mandatory Checklist

PRs will only be reviewed after checklist is complete

• Add input/output type hints to new functions/methods
• Write design document if needed (Do I need to write a design document?)
• Write/update unit tests
• Write/update integration tests
• Write/update functional tests if needed
• make pr passes
• make update-reproducible-reqs if dependencies were changed
• Write documentation

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

[hnnasit]

LGTM!