feat(authenticator): Add default error string for LimitExceededException

[mattcreaser]

• PR conforms to Pull Request guidelines.

Issue #, if available: #180

Description of changes:

This PR adds a new string: amplify_ui_authenticator_error_limit_exceeded

Add default handling for the LimitExceededException. This can occur if a user e.g. tries to enter an incorrect confirmation code too many times.

How did you test these changes?

• Unit test
• Entered confirmation code too many times and verified expected message.

Documentation update required?

• No
• Yes (Please include a PR link for the documentation update)

General Checklist

• Added Unit Tests
• Added Integration Tests
• Security oriented best practices and standards are followed (e.g. using input sanitization, principle of least privilege, etc)
• Ensure commit message has the appropriate scope (e.g fix(liveness): message, fix(authenticator): message, fix(all): message)

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