feat: add log retention to defineFunction

[lukebellamy053]

Problem

Currently there is no way to set the log retention or log group of a function created using defineFunction. This is a fairly obvious issue as it means people will be paying for logs they may no longer want

Issue number, if available:

Changes

Added the option to specify a log retention period when using defineFunction

Corresponding docs PR, if applicable:

Validation

Added unit test that validate the cloud formation properties are correctly added

Checklist

• [x] 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.
• [x] If this PR requires a change to the Project Architecture README, I have included that update in this PR.
• [x] If this PR requires a docs update, I have linked to that docs PR above.
• [x] 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[bot]]

🦋 Changeset detected

Latest commit: e18e815759107f0f3b685bfeb0367b311eb32874

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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