Add a \getenv command to psql.

\getenv fetches the value of an environment variable into a psql
variable.  This is the inverse of the \setenv command that was added
over ten years ago.  We'd not seen a compelling use-case for \getenv
at the time, but upcoming regression test refactoring provides a
sufficient reason to add it now.

Discussion: https://postgr.es/m/1655733.1639871614@sss.pgh.pa.us

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