Make vector package optional

[redeboer]

Seems that the vector package is an optional dependency:

phasespace/setup.cfg

Lines 52 to 53 in f6db1e0

	vector =
	vector >= 1.0.0

but it is still required for import phasespace:

phasespace/phasespace/phasespace.py

Line 24 in 1d83735

import vector

What do you think about importing it only for type checking?

[jonas-eschle]

Um, yes, that's exactly how it was supposed to be in the first place, but it seemingly wasn't like this, thanks for catching! Must have overlooked something, or some pre-commit.

I'll just make a new release, patch fix

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 46.15385% with 7 lines in your changes are missing coverage. Please review.

❗ No coverage uploaded for pull request base (main@f6db1e0). Click here to learn what that means.

Files	Patch %	Lines
phasespace/phasespace.py	46.15%	6 Missing and 1 partial ⚠️

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #110   +/-   ##
=======================================
  Coverage        ?   90.29%           
=======================================
  Files           ?        8           
  Lines           ?      515           
  Branches        ?       94           
=======================================
  Hits            ?      465           
  Misses          ?       34           
  Partials        ?       16           

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