[MacPorts] #44584: [NEW] add a Cargo port

[MacPorts]

#44584: [NEW] add a Cargo port
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 Reporter:  macports.org@…  |      Owner:  macports-tickets@…
     Type:  request         |     Status:  new
 Priority:  Normal          |  Milestone:
Component:  ports           |    Version:  2.3.1
 Keywords:  rust cargo      |       Port:
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 Cargo is the rust project and package manager: http://crates.io

 Although it's in development, so is rust, projects seem to be switching to
 Cargo already, so it would be useful to have it be available alongside
 rust.

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Ticket URL: <https://trac.macports.org/ticket/44584>
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