feat: add constructors for VectorObject4D and MomentumObject4D

[Saransh-cpp]

The branch for VectorObject4D was going stale on my fork. I have decided to keep this open as a draft PR and mark this ready for review once #89 and #231 are merged. This way, I can periodically check on this and keep it synced with the latest changes.

Note
This pull request is built on top of #89 and #231; hence it has the changes of #89 and #231 too. I will sync this PR once #89 and #231 are merged.

[codecov-commenter]

Codecov Report

Base: 83.70% // Head: 82.67% // Decreases project coverage by -1.03% ⚠️

Coverage data is based on head (9c54f3e) compared to base (b1bd185).
Patch coverage: 65.18% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #232      +/-   ##
==========================================
- Coverage   83.70%   82.67%   -1.03%     
==========================================
  Files          96       96              
  Lines       10787    11424     +637     
==========================================
+ Hits         9029     9445     +416     
- Misses       1758     1979     +221     

Impacted Files	Coverage Δ
src/vector/backends/object.py	74.85% <52.85%> (-0.98%)	⬇️
src/vector/_methods.py	74.34% <66.66%> (-3.61%)	⬇️
src/vector/backends/numpy.py	80.00% <66.66%> (ø)

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