[MacPorts] #62715: Add the supported_archs field to port info

[MacPorts]

#62715: Add the supported_archs field to port info
-----------------------------------+--------------------
 Reporter:  jrjsmrtn               |      Owner:  (none)
     Type:  enhancement            |     Status:  new
 Priority:  Normal                 |  Milestone:
Component:  base                   |    Version:  2.6.4
 Keywords:  supported_archs arm64  |       Port:
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 With the current collective work on arm64 ports, it could be useful to
 have the `port info` command output the supported_archs and build_arch
 fields.

 That way, we could easily check which ports are available for x86_64
 and/or arm64, and determine what still needs to be ported/tested ;-)

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Ticket URL: <https://trac.macports.org/ticket/62715>
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