chore: add declare_tx fixture to compilation tests

[ArniStarkware]

Importing this PR from the mempool repo: starkware-libs/mempool#515

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This change is 

[ArniStarkware]

• feat: use command line compiler in gateway #466
• feat: use the installed starknet-sierra-compile crate to compile #331
• chore(gateway): rename cairo_lang_compiler file #330
• refactor: define sierra to casm compiler trait #319
• refactor: move the panic catch into the compile sierra to casm method #318
• chore: expose max bytecode size arg for the compile sierra to casm util #283
• chore: add declare_tx fixture to compilation tests #250 👈
• main

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[Yael-Starkware]

Reviewed all commit messages.
Reviewable status: 0 of 1 files reviewed, 1 unresolved discussion (waiting on @ArniStarkware, @dafnamatsry, and @yair-starkware)

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crates/gateway/src/compilation_test.rs line 22 at r1 (raw file):

    assert_matches!(
        rpc_declare_tx(),
        RpcTransaction::Declare(declare_tx) => declare_tx

Suggestion:

RpcTransaction::Declare(RpcDeclareTransaction::V3(declare_tx)) => declare_tx

[ArniStarkware]

Reviewable status: 0 of 1 files reviewed, all discussions resolved (waiting on @dafnamatsry and @yair-starkware)

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crates/gateway/src/compilation_test.rs line 22 at r1 (raw file):

    assert_matches!(
        rpc_declare_tx(),
        RpcTransaction::Declare(declare_tx) => declare_tx

Done.

[Yael-Starkware]

Reviewed 1 of 1 files at r2, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @dafnamatsry and @yair-starkware)