add unix Socket support to MetricsPort

tor recently got support for MetricsPort in v0.4.5.1-alpha (#40063 (closed)). According to the man page MetricsPort does not support unix sockets (like SocksPort or ControlSocket).

Using a socket allows for better access control than for example binding it to localhost and only allowing localhost in MetricsPortPolicy because that would allow any local process to access it.

Edited Nov 23, 2020 by David Goulet

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