[request]: Support custom connectors for aws-config and generated services

[rcoh]

Tell us about your request

support easily dropping in custom HTTPS and connector implementations

Tell us about the problem you're trying to solve.

1. I want to be able to easily provide my own TLS implementation (eg. rustls with custom CA certs)
2. It should be straightforward to set this both for aws-config as well as services like aws-s3

Are you currently working around this issue?

• I can set a DynConnector for aws-config but it doesn't obey timeouts
• with_tcp_connector expects something that returns TcpStream as a response but that doesn't actually work with connectors from rustls which return MaybeHttps as the response.

Additional context

No response

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