refactor!(projects): Make arguments kw-only

[tony]

To make passing as a configuration file (#315 and vcs-python/vcspull#362) easier, deprecate positional arguments.

Deprecated in >=0.13:

GitProject('https://github.com/vcs-python/libvcs.git')

New style in >=0.13:

GitProject(url='https://github.com/vcs-python/libvcs.git')

See also:

• PEP 570: https://peps.python.org/pep-0570/
• https://peps.python.org/pep-0570/#:~:text=def%20kwd_only_arg*%2C%20arg)(%3A)

[codecov]

Codecov Report

Merging #364 (57e03f1) into master (2ecdc84) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #364      +/-   ##
==========================================
+ Coverage   70.22%   70.25%   +0.03%     
==========================================
  Files          21       21              
  Lines        1857     1859       +2     
==========================================
+ Hits         1304     1306       +2     
  Misses        553      553              

Impacted Files	Coverage Δ
libvcs/projects/base.py	100.00% <100.00%> (ø)
libvcs/projects/git.py	77.52% <100.00%> (+0.08%)	⬆️
libvcs/projects/svn.py	65.26% <100.00%> (+0.36%)	⬆️
libvcs/shortcuts.py	100.00% <100.00%> (ø)

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