feat(authenticator): add react native support for email mfa

[jjarvisp]

Description of changes

#6344

Original PR is stuck in CI limbo due to being a PR from a fork that is not targeting main.
See: https://github.com/aws-amplify/amplify-ui/blob/main/.github/workflows/receive-fork-review.yml#L17

Issue #, if available

Description of how you validated changes

Checklist

• Have read the Pull Request Guidelines
• PR description included
• yarn test passes and tests are updated/added
• PR title and commit messages follow conventional commit syntax
• If this change should result in a version bump, changeset added (This can be done after creating the PR.) This does not apply to changes made to docs, e2e, examples, or other private packages.

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

[changeset-bot]

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Latest commit: a3f9e9a

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