Refactor: async usage in BatchHandler

[michaelfeil]

[codecov-commenter]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (b1284e0) 86.17% compared to head (6dfce70) 87.27%.

Files	Patch %	Lines
libs/infinity_emb/infinity_emb/inference/queue.py	88.88%	3 Missing :warning:
...finity_emb/infinity_emb/inference/caching_layer.py	80.00%	2 Missing :warning:
libs/infinity_emb/infinity_emb/primitives.py	95.65%	1 Missing :warning:

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #56      +/-   ##
==========================================
+ Coverage   86.17%   87.27%   +1.09%     
==========================================
  Files          27       27              
  Lines        1259     1257       -2     
==========================================
+ Hits         1085     1097      +12     
+ Misses        174      160      -14     

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