tls: stronger validation for 'servername' in server.addContext
If 'servername' is not provided, 'ERR_MISSING_ARGS is thrown. If 'servername' is not a string, 'ERR_INVALID_ARG_TYPE' is thrown. If 'servername' is an IP address, 'ERR_INVALID_ARG_VALUE' is thrown, since literal IPv4 and IPv6 addresses are not permitted in SNI.
Fixed API documentation ('hostname' -> 'servername').
Also removed a redundant error 'ERR_TLS_REQUIRED_SERVER_NAME'.
This PR was inspired by: https://github.com/nodejs/node/pull/19988
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
documentation is changed or added -
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