Added serializer option to redis backend.

[s3rius]

Closes #56

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 88.57143% with 4 lines in your changes missing coverage. Please review.

Project coverage is 93.24%. Comparing base (386b5bb) to head (f536b4f).

Files	Patch %	Lines
taskiq_redis/redis_broker.py	80.00%	2 Missing ⚠️
taskiq_redis/redis_backend.py	93.75%	1 Missing ⚠️
taskiq_redis/schedule_source.py	88.88%	1 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #57      +/-   ##
===========================================
- Coverage    94.13%   93.24%   -0.90%     
===========================================
  Files            8        7       -1     
  Lines          358      370      +12     
===========================================
+ Hits           337      345       +8     
- Misses          21       25       +4     

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