ENH: Make --version output just version, and CMD --version output module and its version

[yarikoptic]

I might have went a little too wild, but I felt that having clean output
of datalad --version is nice -- it could facilitate use by scripts since
would no longer need parsing etc (but also might break them now).

So here is how it would look now with these changes:

$> datalad --version
0.14.1.dev129

$> datalad install --version
datalad 0.14.1.dev129

$> datalad containers-list --version
datalad_container 1.1.2

$> git-annex-remote-datalad --version
datalad 0.14.1.dev129

Closes #5527

edit: a side effect, it also addresses #3067 which was worked around via adding -- to separate out command for datalad run. Now would even work in the datalad run whatever --version without --

[codecov]

Codecov Report

Merging #5543 (b0e3220) into master (f2f95b3) will increase coverage by 0.04%.
The diff coverage is 80.76%.

❗ Current head b0e3220 differs from pull request most recent head 02635fd. Consider uploading reports for the commit 02635fd to get more accurate results

@@            Coverage Diff             @@
##           master    #5543      +/-   ##
==========================================
+ Coverage   88.52%   88.56%   +0.04%     
==========================================
  Files         296      296              
  Lines       42467    42510      +43     
==========================================
+ Hits        37592    37651      +59     
+ Misses       4875     4859      -16     

Impacted Files	Coverage Δ
datalad/cmdline/common_args.py	100.00% <ø> (ø)
datalad/customremotes/main.py	25.49% <0.00%> (ø)
datalad/support/gitrepo.py	91.61% <ø> (ø)
datalad/cmdline/helpers.py	69.82% <72.00%> (-0.05%)	⬇️
datalad/cmdline/tests/test_main.py	95.17% <85.71%> (-1.16%)	⬇️
datalad/cmdline/main.py	75.31% <100.00%> (+0.31%)	⬆️
datalad/core/local/tests/test_run.py	100.00% <100.00%> (ø)
datalad/interface/tests/test_base.py	99.15% <100.00%> (ø)
datalad/support/tests/test_gitrepo.py	99.80% <100.00%> (ø)
datalad/downloaders/credentials.py	84.11% <0.00%> (-1.18%)	⬇️
... and 17 more

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[kyleam]

Looks good to me, and it's nice that it fixed the deeper issue in gh-3067.

[kyleam]

I don't feel strongly about it, but my vote would be to just stick with the previous output and always include the name.

[yarikoptic]

I am also luke warm about this change -- benefit is minimal and it might break someone's (unlikely but possible to exist) script. May be @mih has an opinion on this minute aspect?

[yarikoptic]

ok, added a commit to revert back to the prior behavior for datalad --version (left possibility/option in the function to exclude just in case). So should be ready to go if no tests broken