feat!: iauth updates

[suhussai]

Issue # (if applicable)

Closes #54 , #53

Reason for this change

The objective of this PR is to simplify the IAuth interface.

Description of changes

• replace REST API GW with HTTP API GW
• update custom resource in cognito-auth to only create resources that cannot be created in CDK
• replacing custom authorizer with jwtAuthorizer
• enabling PUT /tenants to be protected with JWT Auth instead of IAM. This means that it is available via sync for saas Admin and async for eventBridge target
• added another client for m2m flow. This is used for eventBridge to APIGW authZ
• removed ControlPlaneIDPDetails -- too cryptic/vague
• add pagination for GET /tenants and GET /users
• update sbt-aws cli to allow updating tenants and pagination for GET /tenants and GET /users
• simplified user-mgmt APIs and standardized responses
• added tests for /users functionality

Description of how you validated changes

Checklist

• [x] My code adheres to the CONTRIBUTING GUIDE

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[PeterGFernandez]

Appreciate the addition of support for pagination here; thank you 😎