refactor: move state reader modules to a new crate

[Itay-Tsabary-Starkware]

Stack:

• refactor: move rpc state reader to state reader crate #492
• refactor: move state reader modules to a new crate #486 ⬅
• build: init state reader crate #483

⚠️ Part of a stack created by spr. Do not merge manually using the UI - doing so may have unexpected results.

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This change is 

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.38%. Comparing base (c44d947) to head (c806208).

Additional details and impacted files

@@                                       Coverage Diff                                       @@
##           pr/Itay-Tsabary-Starkware/tsabary/state_reader_client/8a8b91d3     #486   +/-   ##
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  Coverage                                                           83.38%   83.38%           
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  Files                                                                  37       37           
  Lines                                                                1776     1776           
  Branches                                                             1776     1776           
===============================================================================================
  Hits                                                                 1481     1481           
  Misses                                                                218      218           
  Partials                                                               77       77           

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