Add version number to gz.common python binding

[azeey]

🦟 Bug fix

Fixes #2092

Summary

This also fixes a pytest warning

Checklist

• Signed all commits for DCO
• Added tests
• Updated documentation (as needed)
• Updated migration guide (as needed)
• Consider updating Python bindings (if the library has them)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
• While waiting for a review on your PR, please help review another open pull request to support the maintainers

Note to maintainers: Remember to use Squash-Merge and edit the commit message to match the pull request summary while retaining Signed-off-by messages.

[codecov]

Codecov Report

Merging #2093 (054d511) into main (d839caf) will increase coverage by 0.91%.
Report is 140 commits behind head on main.
The diff coverage is 72.46%.

❗ Current head 054d511 differs from pull request most recent head 66d47b6. Consider uploading reports for the commit 66d47b6 to get more accurate results

@@            Coverage Diff             @@
##             main    #2093      +/-   ##
==========================================
+ Coverage   64.48%   65.39%   +0.91%     
==========================================
  Files         341      318      -23     
  Lines       27143    30037    +2894     
==========================================
+ Hits        17502    19643    +2141     
- Misses       9641    10394     +753     

Files Changed	Coverage Δ
include/gz/sim/System.hh	100.00% <ø> (ø)
include/gz/sim/Util.hh	100.00% <ø> (ø)
include/gz/sim/components/Component.hh	100.00% <ø> (ø)
include/gz/sim/detail/EntityComponentManager.hh	94.01% <ø> (+0.14%)	⬆️
include/gz/sim/gui/GuiEvents.hh	0.00% <ø> (ø)
src/Model.cc	96.15% <ø> (+0.15%)	⬆️
src/SystemLoader.cc	71.42% <ø> (+8.01%)	⬆️
src/gui/GuiEvents.cc	44.44% <ø> (+8.08%)	⬆️
src/gui/GuiRunner.cc	52.38% <ø> (+1.70%)	⬆️
src/gui/plugins/modules/EntityContextMenu.cc	18.09% <0.00%> (-1.69%)	⬇️
... and 60 more

... and 136 files with indirect coverage changes