feat: Add Cairo Programs

[zmalatrax]

Add a baseline for the Cairo VM conformance tests. The Cairo programs come from the cairo-vm/cairo_programs folder.

I'm proposing a reordering of the directory tree.

• cairo_programs renamed conformance
• Clear distinction between Cairo and Cairo Zero programs (cairo and cairo-0 dir)
• A sub-directory starknet for Starknet contracts in the cairo dir
• Removal of the benchmarks programs (or at least refactored outside conformance
• Enforce use of snake_case for every directory (in case of local import in Cairo programs)
• Update the CI to verify that every Cairo programs compile (Cairo Zero compiler, Cairo 1 compiler & Cairo 2 compiler for Programs/Contracts) (currently only the Cairo Zero programs compilation has been set up in the CI)

A few things that haven't been done yet/need further thinking:

• Separate in two distinct folders the programs with and without hints
• The proof-programs only links Cairo Zero programs, either make it as subdir of cairo-0 or add Cairo programs as well 🤔
• Should the noretrocompat be kept? I think so
• Should the yet to be released tests included? (e.g. mod_builtin_feature, print_feature)

Directly include the compiled version of the programs ?