feat: use watch and code flags at the same time

[mndeveci]

Why is this change necessary?

This change was requested to speed up development pace when using sam sync. Users want to skip any Infra Sync (CFN deployment) when they know there are no template changes or they don't want to sync their template changes yet and want to do a quick code sync.

How does it address the issue?

With this change, users now allowed to combine --watch flag and --code in sam sync command. When they are used in combination, sam sync will skip all Infra Sync (CFN deployment) actions to speed up development. Users have to run sam sync without --code flag to sync their template changes with their deployed stack.

What side effects does this change have?

With this new combination, template changes won't be synced with deployed stack. Users will be warned with a message to run the sam sync command without --code flag.

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! 🚀