Add TLS and HTTP protocol to kestrel-connection-duration counter

[JamesNK]

Fixes #47831

New tags:

• tls-protocol - The TLS protocol of the connection.

  • Value is SslProtocols converted to a string.
  • Only present if the connection is SSL/TLS.

• http-protocol - The HTTP protocol of the connection.

  • Value is HTTP/1.1, HTTP/2, HTTP/3.
  • Only present if the connection is HTTP.
  • Note that the value here doesn't necessarily match the version in the HTTP request. For example, the client could send HTTP/1.0 request, and the HTTP/1.1 server connection will process it.