Feat/remove cron dependency

[aarmoa]

• Refactored timeout height synchroniztion logic to be solved by just using asyncio tasks. Removed dependency on aiocron

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (8048f0c) 56.52% compared to head (1d0e795) 56.66%.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #260      +/-   ##
==========================================
+ Coverage   56.52%   56.66%   +0.13%     
==========================================
  Files          17       17              
  Lines        2031     2042      +11     
  Branches      240      241       +1     
==========================================
+ Hits         1148     1157       +9     
- Misses        847      848       +1     
- Partials       36       37       +1     

Files	Coverage Δ
pyinjective/async_client.py	50.71% <73.33%> (+0.71%)	⬆️

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