adds architecture prop on defineFunction

[ykethan]

Problem

Allows users to chooses between x86_64 and arm64 for the function. As arm64 could provide a better price and performance than the equivalent function running on x86_64 architecture
https://aws.amazon.com/blogs/apn/comparing-aws-lambda-arm-vs-x86-performance-cost-and-analysis-2/
https://docs.aws.amazon.com/lambda/latest/dg/foundation-arch.html

Issue number, if available:

Changes

Corresponding docs PR, if applicable:

Validation

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.

[changeset-bot]

🦋 Changeset detected

Latest commit: 11c9f67

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@aws-amplify/backend-function	Minor

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