tests: add test fixture for easier abstraction

[greged93]

PR for the update of the test setup. Provides a set of high level abstractions that allow testers to easily set up initial tests conditions, run the test and directly expect test outcome.

Below are some examples of the usage of the framework:

    // Start a sequencer node with a follower node and configure the sequencer.
    let mut fixture = TestFixture::builder()
     .sequencer()
     .followers(1)
     .auto_start(true)
     .allow_empty_blocks(false)
     .build()
     .await?;

    // Set the l1 to synced and expect an Optimistic Sync event.
    fixture.l1().sync().await?;
    fixture.expect_event().optimistic_sync().await?;
   
    // Inject a transfer to the sequencer and build a block, expecting block number 10, containing the injected transaction.
    let hash = fixture.inject_transfer().await?;
    fixture.build_block().expect_block_number(10).expect_tx(hash).await_block().await?;

    // For node 0 (sequencer node), add a L1 message with L1 block number 10, a sender, value 0, and destination 0.
    fixture
        .l1()
        .for_node(0)
        .add_message()
        .at_block(10)
        .sender(address!("f39Fd6e51aad88F6F4ce6aB8827279cffFb92266"))
        .value(0)
        .to(Address::ZERO)
        .send()
        .await?;

[codspeed-hq]

CodSpeed Performance Report

Merging #407 will not alter performance

_{Comparing tests/improve-framework (c3aaaee) with main (05870a0)}

Summary

✅ 2 untouched

[frisitano]

Added some comments inline.