fix(deps): apply updates for hyper v1

[MichaIng]

@ravenclaw900 I merged hyper and flexible-hyper-server-tls here, as well as my draft for needed code changes.

The hyper module structure has changed a little, and I should be able to fix/add all needed imports, but code-wise likely not, especially now that I see routes.rs needs to be updated as well.

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• to_bytes has been removed: https://github.com/hyperium/hyper/blob/0eb1b6c/CHANGELOG.md?plain=1#L298
• Body structure has been removed
• conn was previously defined as conn: &flexible_hyper_server_tls::HttpOrHttpsConnection
• The loop at the bottom of main.rs is not required anymore, right? Still needed, can be done just like before.

[MichaIng]

Here the updates I did:

• General update of main.rs according to examples of flexible-hyper-server-tls and Hyper itself.
• Request type => hyper::body::Incoming
• Response type => http_body_util::combinators::BoxBody, needed to wrap the different responses we sent, IIUC
  • Used http_body_util's Full and Empty with bytes::Bytes accordingly, with functions suggested by Hyper examples.
• http_body_util::BodyExt allowed a simple hyper::body::to_bytes replacement.

This is still missing:

• Updating the websocket handler
• We added the remote_addr to the info_span, passed to the router. I am however not sure if or whether it can be derived, and whether it is actually needed, or informational only? For now, I hardcoded it, just to leave that part in the code, and at least the build does not complain about it 😅.
• There is some build warning about a "borrow of moved value" &req, which I do not understand. Switching to http_body_util::BodyExt's to_bytes() lead to &hyper::body::to_bytes(req.body_mut()).await? => &req.collect().await?.to_bytes(), with & still required, but there is another &req call, which seems to collide now. Not sure how to resolve this.