chore(protocol): enhancements to simulation setup and execution documentation

[NaijaCoderGirl]

Summary

I've fixed the simulation forge command in package.json and restructured the protocol simulations README to improve the experience when following the commands to simulate and test the protocol.

Key Changes

• Commit 4fd3a2e modifies the export:simconf script in package.json to target the test_L2_NoFeeCheck_simulation test rather than the previously referenced test_simulation. This adjustment aligns with the updates from PR feat(protocol)!: re-implement multi-hop bridging with optional caching #15761, which introduced the test_L2_NoFeeCheck_simulation tests while removing the test_simulation.

• Commit 7d8c60c updates the README.md in the packages/protocol/simulation directory. The new README layout offers a clear, step-by-step guide for setting up the simulation environment, including a reminder to run foundryup for updating Foundry tools, which is a step I found necessary during the process.

Rationale for Updates

The motivation behind these changes is to address the issue with the current command forge test --match-test 'test_simulation' -vv > simulation/out/simconf_$(date +%s).txt" failing due to the removal of test_simulation tests from packages/protocol/test/L2/TaikoL2.t.sol. This was notably changed in this commit, while the introduction of test_L2_NoFeeCheck_simulation tests occurred in another commit, leading to the need t o update it.

Testing:

After fixing the command in package.json, I generated PNG images of the simulation to visually verify the outcomes. The images named <timestamp>_above_average_traffic.png, <timestamp>_below_average_traffic.png, and <timestamp>_target_traffic.png illustrate the simulation results under various traffic conditions.