Add CASM class hash

[SantiagoPittella]

Description

• Adds CasmContractClass class hashing.

closes #815

Checklist

• Linked to Github Issue
• Unit tests added
• Integration tests added.
• This change requires new documentation.
  • Documentation has been added/updated.

[codecov-commenter]

Codecov Report

Merging #814 (d2c0dc4) into main (dce8b59) will increase coverage by 0.02%.
The diff coverage is 94.66%.

@@            Coverage Diff             @@
##             main     #814      +/-   ##
==========================================
+ Coverage   91.77%   91.80%   +0.02%     
==========================================
  Files          52       53       +1     
  Lines       12297    12388      +91     
==========================================
+ Hits        11286    11373      +87     
- Misses       1011     1015       +4     

Impacted Files	Coverage Δ
src/core/contract_address/casm_contract_address.rs	94.66% <94.66%> (ø)

... and 8 files with indirect coverage changes