Remove usages of deprecated LocalStack code features in AWS replicator

[alexrashed]

Currently, the AWS Replicator extension is using some parts of the LocalStack codebase which is deprecated and about to be removed:

• localstack.utils.server.http2_server.run_server which is based on Quart (which has been superseded by the underlying hypercorn quite some time ago).
• localstack.aws.api.HttpRequest which should be replaced with localstack.http.Request.

These usages are currently blocking the following PRs in localstack/localstack:

• remove remaining (transitive) usages of Quart localstack#9754
• remove deprecated HttpRequest type alias localstack#9757

It would be best to refactor the AWS Replicator Extension such that it spawns the Auth Proxy a new Gateway (and migrate the logic to a implement a LocalStack handlerchain handler).
/cc @lukqw @whummer @thrau