Improve real-time / sleep strategy, async await for queues and result futures

[michaelfeil]

• speed up using plain asyncio.Future events when waiting for results.
• Implement sorting by oldest embedding first (currently slow)
• Improve real-time / sleep strategy -> removed a time.sleep

Closes #11

[codecov-commenter]

Codecov Report

Attention: 13 lines in your changes are missing coverage. Please review.

Comparison is base (10cd8e3) 87.41% compared to head (4443006) 86.34%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #12      +/-   ##
==========================================
- Coverage   87.41%   86.34%   -1.07%     
==========================================
  Files          16       16              
  Lines         556      542      -14     
==========================================
- Hits          486      468      -18     
- Misses         70       74       +4     

Files	Coverage Δ
...nfinity_emb/infinity_emb/inference/select_model.py	94.44% <100.00%> (+0.15%)	⬆️
...ty_emb/infinity_emb/inference/threading_asyncio.py	100.00% <100.00%> (+20.00%)	⬆️
libs/infinity_emb/infinity_emb/infinity_server.py	84.48% <100.00%> (+0.35%)	⬆️
...finity_emb/infinity_emb/inference/batch_handler.py	90.79% <93.18%> (-0.67%)	⬇️
.../infinity_emb/infinity_emb/inference/primitives.py	70.58% <44.44%> (-29.42%)	⬇️

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