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Add kTLS options and SSL_sendfile #2203

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This adds the ability to enable OpenSSL kTLS, but since all current downstream libs do not support sendfile, I only tested that kTLS works.

The crate's SslStream also does not support kTLS, because it does not directly pass the socket to OpenSSL.
If anyone wants to use kTLS must create a BIO using BIO_new_socket through openssl-sys and write own SslStream.

Note:
During my testing, OpenSSL 3.2 seemed to cause a memory leak when kTLS was enabled but not supported by the kernel, but I could not find any relevant bug reports.
I tried downgrading to OpenSSL 3.1 and the memory leak no longer occurred.
The memory leak also did not occur in OpenSSL 3.2 without kTLS enabled.

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