Batch Execution NotImplementedError

[BrunoLiegiBastonLiegi]

This just implements a small check for batch execution and raises an error.

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (48b5166) 100.00% compared to head (4b963b3) 99.90%.

Files	Patch %	Lines
src/qibojit/backends/cpu.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##              main     #166      +/-   ##
===========================================
- Coverage   100.00%   99.90%   -0.10%     
===========================================
  Files           12       12              
  Lines         1073     1075       +2     
===========================================
+ Hits          1073     1074       +1     
- Misses           0        1       +1     

Flag	Coverage Δ
unittests	99.90% <75.00%> (-0.10%)	⬇️

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