Added result parsing on return.

[s3rius]

This patch adds result parsing when got serialized result from result backend. It requires type annotation for that. Parsing is laxed and if failed, result will be returned as is.

Referenced issue: taskiq-python/taskiq-redis#75

@jegork, this issues appears much deeper into core than I initially thought. Fixing it breaks some backward compatibility.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.98%. Comparing base (a89cac1) to head (ba55f43).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #415      +/-   ##
==========================================
+ Coverage   77.80%   77.98%   +0.18%     
==========================================
  Files          62       62              
  Lines        1933     1949      +16     
==========================================
+ Hits         1504     1520      +16     
  Misses        429      429              

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