feat: add serialisation methods

[alexghr]

Adds toString/toBuffer/fromString/fromBuffer to a couple of classes that didn't have them. Also adds tests for the new functions.
This is needed for future work on proving where proving requests could be sent over the network.

[alexghr]

• feat: add proving queue #5754
• feat: add promiseWithResolvers #5808
• fix: MemoryFifo return null when empty and timeout 0 #5753
• feat: add TimeoutError #5751
• feat: add serialisation methods #5749 👈
• master

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[AztecBot]

Benchmark results

Metrics with a significant change:

• l2_block_processing_time_in_ms (64): 10,183 (-16%)
• note_successful_decrypting_time_in_ms (8): 296 (+36%)
• note_trial_decrypting_time_in_ms (8): 101 (+431%)
• note_trial_decrypting_time_in_ms (64): 118 (+402%)

Detailed 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.

This benchmark source data is available in JSON format on S3 here.

L2 block published to L1

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

Metric	8 txs	32 txs	64 txs
l1_rollup_calldata_size_in_bytes	772	772	772
l1_rollup_calldata_gas	6,808 (+1%)	6,784	6,808
l1_rollup_execution_gas	587,289	587,265	587,289
l2_block_processing_time_in_ms	1,431 (-1%)	5,210 (+1%)	⚠️ 10,183 (-16%)
note_successful_decrypting_time_in_ms	⚠️ 296 (+36%)	512 (-2%)	899 (-1%)
note_trial_decrypting_time_in_ms	⚠️ 101 (+431%)	19.4 (-28%)	⚠️ 118 (+402%)
l2_block_building_time_in_ms	9,766 (+1%)	38,061	76,130
l2_block_rollup_simulation_time_in_ms	9,569 (+1%)	37,366	74,772
l2_block_public_tx_process_time_in_ms	5,333 (+1%)	20,987 (+1%)	42,029 (+1%)

L2 chain processing

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

Metric	5 blocks	10 blocks
node_history_sync_time_in_ms	15,854 (+8%)	29,708 (+3%)
note_history_successful_decrypting_time_in_ms	1,170 (+4%)	2,305 (+4%)
note_history_trial_decrypting_time_in_ms	38.3 (-8%)	92.4 (+17%)
node_database_size_in_bytes	18,804,816 (+1%)	34,910,288
pxe_database_size_in_bytes	29,859	59,414

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	151 (+1%)	44,561	26,424
private-kernel-inner	155	72,188	26,424
private-kernel-ordering	109 (+1%)	51,090	39,297
base-parity	50.7 (-2%)	128	311
root-parity	9.76 (-3%)	1,244	311
base-rollup	12,433	110,820	957
root-rollup	47.8 (-1%)	4,551	821
public-kernel-app-logic	81.5 (+1%)	48,151	40,933
public-kernel-tail	121	53,644	7,385
merge-rollup	11.0 (-19%)	2,760	957
public-kernel-teardown	75.8 (-3%)	48,151	40,933
public-kernel-setup	75.1 (-3%)	48,151	40,933

Tree insertion stats

The duration to insert a fixed batch of leaves into each tree type.

Metric	1 leaves	16 leaves	64 leaves	128 leaves	512 leaves	1024 leaves	2048 leaves	4096 leaves	32 leaves
batch_insert_into_append_only_tree_16_depth_ms	10.9 (-1%)	17.5 (-2%)	N/A	N/A	N/A	N/A	N/A	N/A	N/A
batch_insert_into_append_only_tree_16_depth_hash_count	16.8	31.6	N/A	N/A	N/A	N/A	N/A	N/A	N/A
batch_insert_into_append_only_tree_16_depth_hash_ms	0.639 (-1%)	0.541 (-2%)	N/A	N/A	N/A	N/A	N/A	N/A	N/A
batch_insert_into_append_only_tree_32_depth_ms	N/A	N/A	51.0 (-1%)	80.4 (-4%)	259	504	977	1,945 (-4%)	N/A
batch_insert_into_append_only_tree_32_depth_hash_count	N/A	N/A	96.0	159	543	1,055	2,079	4,127	N/A
batch_insert_into_append_only_tree_32_depth_hash_ms	N/A	N/A	0.522 (-1%)	0.496 (-4%)	0.472	0.471	0.464	0.465 (-4%)	N/A
batch_insert_into_indexed_tree_20_depth_ms	N/A	N/A	59.7 (-1%)	118 (-2%)	374	740	1,455	2,913 (-1%)	N/A
batch_insert_into_indexed_tree_20_depth_hash_count	N/A	N/A	105	207	691	1,363	2,707	5,395	N/A
batch_insert_into_indexed_tree_20_depth_hash_ms	N/A	N/A	0.529 (-1%)	0.534 (-2%)	0.509	0.509	0.505	0.507 (-1%)	N/A
batch_insert_into_indexed_tree_40_depth_ms	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	67.0 (-1%)
batch_insert_into_indexed_tree_40_depth_hash_count	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	109
batch_insert_into_indexed_tree_40_depth_hash_ms	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	0.586 (-1%)

Miscellaneous

Transaction sizes based on how many contract classes are registered in the tx.

Metric	0 registered classes	1 registered classes
tx_size_in_bytes	41,005	528,889

Transaction size based on fee payment method

Metric	native fee payment method	fpc_public fee payment method	fpc_private fee payment method
tx_with_fee_size_in_bytes	905	1,161	1,377

Transaction processing duration by data writes.

Metric	0 new note hashes	1 new note hashes	2 new note hashes
tx_pxe_processing_time_ms	1,138 (-1%)	786	3,285 (-4%)

Metric	1 public data writes	2 public data writes	3 public data writes	4 public data writes	5 public data writes	8 public data writes
tx_sequencer_processing_time_ms	454	294 (-4%)	785 (-4%)	377 (-4%)	1,305 (-4%)	446 (-4%)