feat(auth): Adding `AnalyticsMetadata` to the cognito requests where applicable.

[ivan-kiselev]

Description of changes

Propagating AnalyticsMetadata (doc) among with some cognito requests, where applicable, so cognito statistics are reflected in AWS Pinpoint analytics.

Issue #12877

Description of how you validated changes

SignUp request linked library produces, screenshot from browser:

After confirming email, I can observe sign up event on Pinpoint Analytics dashboard

Checklist

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

Checklist of requests to propagate metadata with

• [x] ConfirmForgotPasswordRequest
• [x] ConfirmSignUpRequest
• [x] InitiateAuthRequest
• [x] ResendConfirmationCodeRequest
• [x] RespondToAuthChallengeRequest
• [x] SignUpRequest

Testing in sample project

To test in sample project, one needs to yarn link both @aws-amplify/core and @aws-amplify/auth, because base Amplify config changed as well.

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

[ivan-kiselev]

@elorzafe @nadetastic ping

[ivan-kiselev]

Closing it in an absence of any attention from maintainers