[MacPorts] #53851: Add target that bumps version and checksum

[MacPorts]

#53851: Add target that bumps version and checksum
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 Reporter:  l2dy         |      Owner:
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  base         |    Version:
 Keywords:               |       Port:
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 Homebrew has `brew bump-formula-pr`. Such functionality saves a lot of
 work when updating many ports.

 Use cases (phoney commands):
 * `port bump <portname> <version>` bumps version and checksums
 * `port bump <portname>` bumps checksums only
 * `port bump --livecheck <portname>` bumps both with livecheck result

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Ticket URL: <https://trac.macports.org/ticket/53851>
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