Add methods related to client hello callback #1456
Open
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These methods allow a server to switch the context when looking at ALPN and servername together. This is for example require when implementing the ACME tls-alpn/1 protocol.
Unfortunately, OpenSSL does not provide any utility function to actually parse ClientHello extensions when using these APIs and the user has to write their own methods.
Closes: 1430
This PR depends on pyca/cryptography#13634 but I am not sure how to express that properly in the build files.