[MacPorts] #74248: `port info` for retired ports or ports installed from a portdir

[MacPorts]

#74248: `port info` for retired ports or ports installed from a portdir
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 Reporter:  RJVB         |      Owner:  (none)
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  base         |    Version:
 Keywords:               |       Port:
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 Currently, one can have a port installed but still get a "port not found"
 error when doing `port info foo`, for instance because the port in
 question has been retired from the ports tree (but is still installed) or
 because it was installed from a local portdir.

 I think that all comparable package management systems that I know will
 provide the information of the installed package in situations like this.

 MacPorts could do that too, because it maintains copies of the Portfiles
 of all installed ports under
 `$prefix/libexec/macports/registry/portfiles`. It could at least try to
 use those files (generating warnings instead of errors for any missing
 PortGroups).

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Ticket URL: <https://trac.macports.org/ticket/74248>
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