Add support for TLS on H2 NIOTS server transport #2040
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Motivation
We currently have a NIOTS server transport implementation in gRPC v2, but it doesn't support TLS.
Modifications
This PR adds support for TLS in the NIOTS-backed HTTP/2 implementation of the server transport for gRPC v2.
It also adds support for ALPN, to validate that the negotiated protocol, if required, is HTTP2 or
grpc-exp. If it's not, an error will be fired/the channel will be closed, since we don't support H1.Result
We now support TLS/ALPN when using the NIOTS server transport in gRPC V2.