refactor: move rpc state reader to state reader 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

Attention: Patch coverage is 40.74074% with 16 lines in your changes missing coverage. Please review.

Project coverage is 83.34%. Comparing base (c806208) to head (145b276).

Files	Patch %	Lines
crates/state_reader/src/errors.rs	0.00%	12 Missing ⚠️
crates/state_reader/src/config.rs	73.33%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@                                        Coverage Diff                                         @@
##           pr/Itay-Tsabary-Starkware/tsabary/state_reader_client/53ab0222     #492      +/-   ##
==================================================================================================
- Coverage                                                           83.38%   83.34%   -0.05%     
==================================================================================================
  Files                                                                  37       39       +2     
  Lines                                                                1776     1777       +1     
  Branches                                                             1776     1777       +1     
==================================================================================================
  Hits                                                                 1481     1481              
- Misses                                                                218      219       +1     
  Partials                                                               77       77              

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