Add locks to process operations to prevent race conditions.

[karajan1001]

fix: #93

Our old solution on #53, can reduce possibility of race condition, but it still happens occasionally.

1. Add locks to write and read operations to prevent this kind of error.
2. Use reraise to simplify the code in __getitem__

[codecov-commenter]

Codecov Report

Base: 77.96% // Head: 77.81% // Decreases project coverage by -0.14% ⚠️

Coverage data is based on head (5d3c583) compared to base (22b25a4).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #95      +/-   ##
==========================================
- Coverage   77.96%   77.81%   -0.15%     
==========================================
  Files          21       21              
  Lines         912      915       +3     
  Branches      140      142       +2     
==========================================
+ Hits          711      712       +1     
+ Misses        178      176       -2     
- Partials       23       27       +4     

Impacted Files	Coverage Δ
src/dvc_task/proc/manager.py	77.47% <100.00%> (+1.37%)	⬆️
src/dvc_task/proc/process.py	86.17% <100.00%> (+0.58%)	⬆️
src/dvc_task/worker/temporary.py	80.32% <0.00%> (-4.92%)	⬇️
tests/worker/test_temporary.py	93.93% <0.00%> (-3.04%)	⬇️
src/dvc_task/contrib/kombu_filesystem.py	39.28% <0.00%> (ø)

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