fix(auth): allow configuration of AuthSessionValidity

[adambartholomew]

Description of changes

Add configuration to allow frontend session state expirations to match the backend AuthSessionValidity (3-15 minutes)

Issue #, if available

#14817

Description of how you validated changes

• Ran test suite
• Built @aws-amplify/auth @aws-amplify/core
• Created yarn links in fork
• Linked into integrating project
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Checklist

• PR description included
• yarn test passes
• Unit Tests are changed or added
• Relevant documentation is changed or added (and PR referenced)

Checklist for repo maintainers

• Verify E2E tests for existing workflows are working as expected or add E2E tests for newly added workflows
• New source file paths included in this PR have been added to CODEOWNERS, if appropriate

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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[osama-rizk]

Hey @adambartholomew 👋

Thanks for opening this PR and for taking the time to contribute! We appreciate you flagging the AuthSessionValidity configuration gap. We'll review the changes and provide feedback soon.