Add Session type which can apply settings to requests created from it

[sbstp]

No description provided.

[sbstp]

Review: @adamreichold

[sbstp]

Going to do a pass on the docs to make sure everything is still coherent.

[sbstp]

@adamreichold hey I was looking at the code and it seems like I missed something. Does rustls listen to the danger_accept_invalid_certs flag?

[adamreichold]

hey I was looking at the code and it seems like I missed something. Does rustls listen to the danger_accept_invalid_certs flag?

It does not. It gets all of its configuration via the ClientConfig data type which is immutable because it is usually shared process-wide. Also note that those two flags do not exist when only the rustls backend is configured. As said in the original rustls MR, I see two options here: Implement API surface abstracting over native-tls and rustls covering the options we feel necessary to expose or align things by exposing TlsConnector directly so that library users can use that to configure things as they wish.