Package version is now computed according to git tree

[francis-clairicia]

What's changed

• Added hatch-vcs build hook
• __version__ is now auto-generated in easynetwork/version.py (not tracked)
• Removed .dev component in .bumpversion.cfg
• In docs/source/conf.py, version and release is now determined using installed package version (thanks to importlib.metadata)

[codecov]

Codecov Report

Merging #162 (e57003f) into main (6ffa105) will not change coverage.
The diff coverage is 100.00%.

Flag	Coverage Δ
OS-Linux	86.41% <100.00%> (ø)
OS-Windows	86.03% <100.00%> (ø)
OS-macOS	86.44% <100.00%> (ø)
Py-3.11	99.89% <100.00%> (ø)
Py-3.12	99.89% <100.00%> (ø)
test-functional	86.46% <100.00%> (ø)
test-unit	83.33% <100.00%> (ø)

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