[MacPorts] #72439: git fetching should support submodules

[MacPorts]

#72439: git fetching should support submodules
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 Reporter:  RJVB         |      Owner:  (none)
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  base         |    Version:
 Keywords:               |       Port:
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 Fetching via git and/or from github and family should support using
 submodules, at least for the `git` `fetch.type`. The github PG and family
 might even add some convenience routines to set up the distfiles for
 "normal" fetching.

 Is there even a good reason not to check out project submodules by
 default?

 I cannot really make out if there is an advantage to checking out a remote
 repo's HEAD with submodules and then checking out the desired commit (as
 the protocol imposes), or checking out the submodules from inside the
 working copy that has already been set to the desired commit.

 What's clear is that supporting `--shallow-since <MM-DD-YYYY>` (combined
 with `--shallow-submodules` can be beneficial for very active, large
 repositories.

 Cf.
 https://github.com/RJVB/macstrop/blob/master/_resources/port1.0/group/github-1.1.tcl

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Ticket URL: <https://trac.macports.org/ticket/72439>
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