[POC] Use single stack for top level functions

[sobolk]

Problem

Certain usage patterns of functions end up with Caused By: ❌ Deployment failed: Error [ValidationError]: Circular dependency between resources:.

This happens is scenarios where it could have been avoided. Just because we pack all functions into same stack and therefore coupling them together.

Changes

This PR explores potential mitigation of the problem in a form of a knob that makes backend to put all top level resources in single stack.

I.e.

const backend = defineBackend({
  auth,
  data,
  myApiFunction,
},{
  useSingleStack: true,
});

Validation

There are two test projects used to reproduce the original problem:

1. test-projects/function-stack-1
2. test-projects/function-stack-2

Both deployed successfully with new setting.

Checklist

• If this PR includes a functional change to the runtime behavior of the code, I have added or updated automated test coverage for this change.
• If this PR requires a change to the Project Architecture README, I have included that update in this PR.
• If this PR requires a docs update, I have linked to that docs PR above.
• If this PR modifies E2E tests, makes changes to resource provisioning, or makes SDK calls, I have run the PR checks with the run-e2e label set.

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

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