Added 300LA load model

[ccaprani]

• Added VehicleLibrary function for arbitrary rail loading to AS5100.2 based on the 300LA
• Moved the Vehicle and VehicleLibrary classes into their own file
• Added new test and new example

[codecov-commenter]

Codecov Report

Merging #31 (f28f4fd) into main (c55ff9f) will increase coverage by 0.57%.
The diff coverage is 82.52%.

❗ Current head f28f4fd differs from pull request most recent head b7e1fad. Consider uploading reports for the commit b7e1fad to get more accurate results

📣 This organization is not using Codecov’s GitHub App Integration. We recommend you install it so Codecov can continue to function properly for your repositories. Learn more

@@            Coverage Diff             @@
##             main      #31      +/-   ##
==========================================
+ Coverage   79.54%   80.11%   +0.57%     
==========================================
  Files          11       12       +1     
  Lines        1134     1177      +43     
==========================================
+ Hits          902      943      +41     
- Misses        232      234       +2     

Impacted Files	Coverage Δ
pycba/vehicle.py	78.04% <78.04%> (ø)
pycba/__init__.py	100.00% <100.00%> (ø)
pycba/bridge.py	34.95% <100.00%> (-8.45%)	⬇️
tests/test_bridge.py	100.00% <100.00%> (ø)

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more