[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
Resolution:               |   Keywords:  arm64
      Port:               |
--------------------------+--------------------
Changes (by ryandesign):

 * keywords:  supported_archs arm64 => arm64


Comment:

 `port info` is supposed to show port information that a user might care
 about. Users shouldn't need to care about `supported_archs`; ports should
 just work regardless of their `supported_archs` or print an error message
 explaining why they cannot be installed. Developers care about
 `supported_archs` and many other things that they can discover by looking
 at the Portfile.

 `build_arch` is a macports.conf setting. It doesn't belong in `port info`.

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Ticket URL: <https://trac.macports.org/ticket/62715#comment:1>
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