refactor: use snapi class info in process declare tx

[ArniStarkware]

During the function process_tx in the gateway, the compilation (sierra to casm) occurs.
In this PR, we change the compilation's return type from blockifier::execution::contract_class::ClassInfo to starknet_api::contract_class::ClassInfo.

In the following PRs, MempoolInput will (indirectly) use starknet_api::..::ClassInfo.

This change is 

[ArniStarkware]

• refactor: create executable tx in the gateway process_tx #517 : 2 dependent PRs (#518 , #519 )
• refactor: use snapi class info in process declare tx #516 👈
• chore: streamline the starknet api contract class object #524
• main

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[dafnamatsry]

Reviewed 1 of 4 files at r1, 2 of 2 files at r2, 1 of 1 files at r3, all commit messages.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @ArniStarkware, @ayeletstarkware, @MohammadNassar1, and @yair-starkware)

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crates/gateway/src/compilation_test.rs line 105 at r3 (raw file):

    let class_info = gateway_compiler.process_declare_tx(&declare_tx).unwrap();
    assert_eq!(class_info.sierra_program_length, sierra_program_length);

Please add also an assertion for the casm_contract_class.

[ArniStarkware]

Reviewable status: 3 of 5 files reviewed, 1 unresolved discussion (waiting on @ayeletstarkware, @dafnamatsry, @MohammadNassar1, and @yair-starkware)

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crates/gateway/src/compilation_test.rs line 105 at r3 (raw file):

Previously, dafnamatsry wrote…

Please add also an assertion for the casm_contract_class.

Done.
This is enough - it hard to compare the entire contract class is as expected. It is enough to see the result casm contract class has the expected hash.

[codecov]

Codecov Report

Attention: Patch coverage is 44.44444% with 5 lines in your changes missing coverage. Please review.

Project coverage is 76.60%. Comparing base (d056964) to head (5aa7df9).
Report is 12 commits behind head on main.

Files	Patch %	Lines
crates/gateway/src/gateway.rs	0.00%	5 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #516   +/-   ##
=======================================
  Coverage   76.60%   76.60%           
=======================================
  Files         348      348           
  Lines       36771    36768    -3     
  Branches    36771    36768    -3     
=======================================
- Hits        28167    28165    -2     
- Misses       6281     6283    +2     
+ Partials     2323     2320    -3     

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[dafnamatsry]

Reviewed 4 of 4 files at r4, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @ayeletstarkware, @MohammadNassar1, and @yair-starkware)