feat: add slicing to vectors

[nstarman]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 2 lines in your changes are missing coverage. Please review.

❗ No coverage uploaded for pull request base (main@ee2dc45). Click here to learn what that means.

Files	Patch %	Lines
src/vector/_base.py	33.33%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #28   +/-   ##
=======================================
  Coverage        ?   93.85%           
=======================================
  Files           ?       23           
  Lines           ?      716           
  Branches        ?        0           
=======================================
  Hits            ?      672           
  Misses          ?       44           
  Partials        ?        0           

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[nstarman]

I'm not sure why the MacOS tests are flaky. They are all passing on my local machine.