Change SierraContractClass abi return type

[tkumor3]

Closes #1306

• change SierraCompiledContract abi type from string to AbiDictList and use marshmallow to verify it
• add raw_abi abi in string. It's needed compute_sierra_class_hash

Introduced changes

• [ ] This PR contains breaking changes

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 94.73684% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 97.80%. Comparing base (0a2cbf2) to head (0f8d55c).

Additional details and impacted files

@@               Coverage Diff               @@
##           development    #1313      +/-   ##
===============================================
+ Coverage        97.10%   97.80%   +0.70%     
===============================================
  Files               94       94              
  Lines             4728     4743      +15     
===============================================
+ Hits              4591     4639      +48     
+ Misses             137      104      -33     

Files	Coverage Δ
starknet_py/contract.py	97.68% <100.00%> (-0.01%)	:arrow_down:
starknet_py/net/client_models.py	99.57% <94.44%> (-0.21%)	:arrow_down:

... and 5 files with indirect coverage changes

[tkumor3]

this seems like a breaking change, I suppose we should include this change in the migration guide. otherwise looks good.

It was a breaking change but I changed it as it was suggested in https://github.com/software-mansion/starknet.py/pull/1313#discussion_r1514680153