AnyBlob Redesign for TLS connection reusage, better caching of fds, and resinging of requests

[durner]

This PR is breaking some existing APIs!

The main features include:

1. Redesign the caching infrastructure to attach fds to dns entries
2. Attach tls connections to fds, to reuse running tls connection (avoid additional handshakes)
3. Better error reporting to the user if provider answers with HttpResponse
4. Allow message resigning with the original provider (e.g., AWS keys have lifetime and it can be necessary to resign a message)
5. Avoid lifelock issues with sendAsync and few open ringbuffer places
6. Various smaller fixes