feat: Events in contract artifacts

[sirasistant]

Closes #2324

Checklist:

Remove the checklist to signal you've completed it. Enable auto-merge if the PR is ready to merge.

• If the pull request requires a cryptography review (e.g. cryptographic algorithm implementations) I have added the 'crypto' tag.
• I have reviewed my diff in github, line by line and removed unexpected formatting changes, testing logs, or commented-out code.
• Every change is related to the PR description.
• I have linked this pull request to relevant issues (if any exist).

[AztecBot]

Benchmark results

All benchmarks are run on txs on the Benchmarking contract on the repository. Each tx consists of a batch call to create_note and increment_balance, which guarantees that each tx has a private call, a nested private call, a public call, and a nested public call, as well as an emitted private note, an unencrypted log, and public storage read and write.

L2 block published to L1

Each column represents the number of txs on an L2 block published to L1.

Metric	8 txs	32 txs	128 txs
l1_rollup_calldata_size_in_bytes	45444	179588	716132
l1_rollup_calldata_gas	222972	867860	3449576
l1_rollup_execution_gas	842059	3594968	22204945
l2_block_processing_time_in_ms	1037	3936	15586
note_successful_decrypting_time_in_ms	327	1004	3688
note_trial_decrypting_time_in_ms	29	107	138
l2_block_building_time_in_ms	8965	36114	149803
l2_block_rollup_simulation_time_in_ms	6655	26845	105831
l2_block_public_tx_process_time_in_ms	2270	9142	43515

L2 chain processing

Each column represents the number of blocks on the L2 chain where each block has 16 txs.

Metric	10 blocks	20 blocks	30 blocks
node_history_sync_time_in_ms	30702	75429	135541
note_history_successful_decrypting_time_in_ms	4502	13045	19938
note_history_trial_decrypting_time_in_ms	236	251	251
node_database_size_in_bytes	1196197	1901991	2755406
pxe_database_size_in_bytes	54187	108338	162578

Circuits stats

Stats on running time and I/O sizes collected for every circuit run across all benchmarks.

Circuit	circuit_simulation_time_in_ms	circuit_input_size_in_bytes	circuit_output_size_in_bytes
private-kernel-init	56.23312883435583	56577	14745
private-kernel-ordering	30.233128834355828	20137	8089
base-rollup	870	631604	810
root-rollup	37.75609756097561	4072	1097
private-kernel-inner	51.86882716049383	72288	14745
public-kernel-private-input	51.24382716049383	37359	14745
public-kernel-non-first-iteration	31.209876543209877	37401	14745
merge-rollup	0.9534883720930233	2592	873