fix: remove 100ms delay on first and subsequent read calls

[SilverMira]

Currently, there is an unnecessary wait with recv_timeout() on reader thread and cache thread.

On reader thread, it causes reading from pipe to have an inherent 100ms wait time between each chunk read.
Similarly, cache thread also has this issue, where read() calls are served throttled with a 100ms delay.

This PR replaces recv_timeout with try_recv so all read() calls will return as soon as possible.

Fixes #75

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.63%. Comparing base (dbbefcd) to head (5a8aab1).

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #76      +/-   ##
==========================================
+ Coverage   77.57%   78.63%   +1.05%     
==========================================
  Files           7        7              
  Lines        1231     1231              
==========================================
+ Hits          955      968      +13     
+ Misses        276      263      -13     

Flag	Coverage Δ
unittests	78.63% <100.00%> (+1.05%)	⬆️

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[andfoy]

Thanks a lot for your contribution @SilverMira!