fix(katana-primitives): fix legacy program conversion between RPC and inner types

[kariy]

Resolves #1356

This PR fixes how legacy contract class is being converted between RPC types (from starknet-rs) and blockifier types (from cairo-vm).

There are some discrepancies for the compiled program types between what is defined by starknet-rs and cairo-vm by lambdaclass. The types from cairo-vm isn't really meant to be used for serialization. As such, it is not possible to convert between the types between these two crates without losing some of the data. For context, there are some fields that exist in starknet-rs definitions but not in cairo-vm's. Which results in the omission some fields during conversions.

I have defined some intermediary types that mirrors the types from those crates in order to be able to de/serialize them into each other. The intermediary types are then transmuted to their original counterpart (This is kinda unsafe as these types don't use a #[repr(..)] that would guarantee their memory layout, so they might have different layouts even if all the fields are in the same order and types. Though I'm not certain how likely that's gonna happen). Perhaps the use of the intermediary types should be better documented for future readers.

A simple test is added just to check that the conversions process is successful. The test doesn't however assert that the types are equal before and after the conversion due to the aforementioned reason.

I believe this is definitely not the most efficient way for doing this conversion. Improvements should be reserved in future PRs.

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (74c12c0) 67.10% compared to head (0d4994d) 67.42%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
crates/katana/primitives/src/conversion/rpc.rs	99.52%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1403      +/-   ##
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+ Coverage   67.10%   67.42%   +0.31%     
==========================================
  Files         231      231              
  Lines       20858    21047     +189     
==========================================
+ Hits        13997    14191     +194     
+ Misses       6861     6856       -5     

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[kariy]

I've spent an unnecessary amount of time trying to implement an approach that doesn't involve modifying our fork of blockifier/cairo-vm.

Will follow this up with a test for the non-legacy contract class conversions.

[kariy]

During the process of implementing this PR, a bug is found due to mistakenly inserting compiled class hashes instead of just class hash. The fix for it is in #1404.