feat: create cognito userpool client that exports both client ID and …

[alxyok]

…client secret to a kubernetes secret (connection details)

What does this PR do?

Introduces a new Crossplane Composition and an XRD for managing AWS Cognito User Pool Clients. The composition enables automated provisioning of UserPoolClient resources based on user-specified inputs and writes connection secrets for the client, including and especially both the client ID and client secret.

Motivation

The current version of the UserPoolClient in the cognito-idp family of providers by AWS only exports client ID as a connection detail. It does not support client secret, which makes it useless if you want to reuse both of those details in other kubernetes resources such as exporting those in two SSM parameters or a secret in Secrets Manager.

More

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Additional Notes