Working basic cognito auth client

[ManavDia]

Hi Redwood guys.
I've implemented Cognito as an auth provider for Redwood. I've tested it working on a work project that relies on Cognito (Via patching), to use it simply instantiate a CognitoUserPool from amazon-cognito-identity-js as the client and pass it to the AuthProvider. The basic functions of Redwood AuthClient are implemented. additional functionality such as OTP or MFA can be accessed by accessing the client object on your useAuth() hook:

const { client } =  useAuth()

client.getCurrentUser()
client.changePassword()
client.sendMFACode()

Full functionality that can be accessed is available to read here: https://www.npmjs.com/package/amazon-cognito-identity-js

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[callingmedic911]

Thanks for the PR @ManavDia! Just wanted to let you know there's already a PR in progress for Cognito, hoping we can all collaborate together. #5745

[Tobbe]

Closing this one in favor of #5745