Added new base class for exceptions, added templates

[chandr-andr]

To check what can this lib - https://gitlab.com/pyctrl/izulu

[codecov]

Codecov Report

Attention: Patch coverage is 90.90909% with 3 lines in your changes missing coverage. Please review.

Project coverage is 77.79%. Comparing base (fec9633) to head (877c6a0).

Files with missing lines	Patch %	Lines
taskiq/brokers/shared_broker.py	33.33%	2 Missing ⚠️
taskiq/brokers/inmemory_broker.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #393      +/-   ##
==========================================
+ Coverage   77.51%   77.79%   +0.28%     
==========================================
  Files          62       62              
  Lines        1899     1923      +24     
==========================================
+ Hits         1472     1496      +24     
  Misses        427      427              

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