Raise Error for batched vector inputs on matmul

[FOsterfeld]

Due Diligence

• General:
  • title of the PR is suitable to appear in the Release Notes
• Implementation:
  • unit tests: all split configurations tested
  • unit tests: multiple dtypes tested
  • benchmarks: created for new functionality
  • benchmarks: performance improved or maintained
  • documentation updated where needed

Description

Issue/s resolved: #1645

Changes proposed:

Type of change

Memory requirements

Performance

Does this change modify the behaviour of other functions? If so, which?

yes / no

[github-actions]

Thank you for the PR!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.13%. Comparing base (b929c74) to head (7b110f0).
Report is 12 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1646   +/-   ##
=======================================
  Coverage   92.12%   92.13%           
=======================================
  Files          83       83           
  Lines       12163    12165    +2     
=======================================
+ Hits        11205    11208    +3     
+ Misses        958      957    -1     

Flag	Coverage Δ
unit	92.13% <100.00%> (+<0.01%)	⬆️

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[github-actions]

Thank you for the PR!

[mrfh92]

Looks fine!
Thanks @FOsterfeld for this and your previous work :)