Extend cairo-native feature to rpc-state-reader crate

[fmoletta]

Currently in main, running cargo test from within the rpc-state-reader source fails, as the code was changed to support the changes made to starknet_in_rust under the cairo-native feature flag without including said feature. This PR adds the cairo-native feature flag to the rpc-state-reader and gates the changes under this flag, so that the tests pass when running make test, and also when running cargo test from within the rpc-state-reader crate.

[codecov-commenter]

Codecov Report

Merging #1147 (59ed9a2) into main (5763f6b) will decrease coverage by 0.16%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1147      +/-   ##
==========================================
- Coverage   89.69%   89.54%   -0.16%     
==========================================
  Files          50       50              
  Lines       14351    14351              
==========================================
- Hits        12872    12850      -22     
- Misses       1479     1501      +22     

see 2 files with indirect coverage changes