fix: Top level init bb.js, but better scoped imports to not incur cost too early

[charlielye]

Related to this issue: #3618
Gets aztec-cli help down to 0.01s!!!!

[AztecBot]

Benchmark results

Metrics with a significant change:

• note_history_trial_decrypting_time_in_ms (10): 226 (-38%)
• note_trial_decrypting_time_in_ms (32): 36.7 (-40%)

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.

Values are compared against data from master at commit c7f18787 and shown if the difference exceeds 1%.

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	45,444	179,588	716,132
l1_rollup_calldata_gas	223,080	868,052	3,449,540
l1_rollup_execution_gas	842,167	3,595,160	22,204,909
l2_block_processing_time_in_ms	2,226 (+1%)	8,439 (-1%)	34,999 (-1%)
note_successful_decrypting_time_in_ms	320 (+2%)	910 (-2%)	3,335 (-1%)
note_trial_decrypting_time_in_ms	29.3 (+26%)	⚠️ 36.7 (-40%)	199 (-1%)
l2_block_building_time_in_ms	20,052 (-1%)	79,921 (-1%)	321,500
l2_block_rollup_simulation_time_in_ms	16,539 (-1%)	66,062 (-1%)	265,873
l2_block_public_tx_process_time_in_ms	3,483 (-1%)	13,785	55,386

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	24,597 (-2%)	47,154 (-2%)
note_history_successful_decrypting_time_in_ms	2,148 (-5%)	4,296 (+1%)
note_history_trial_decrypting_time_in_ms	161 (-1%)	⚠️ 226 (-38%)
node_database_size_in_bytes	3,621,387	3,919,564
pxe_database_size_in_bytes	29,748	59,307

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	199 (-1%)	43,109	20,441
private-kernel-ordering	114 (-1%)	25,833	9,689
base-rollup	2,958	667,692	873
root-rollup	94.0 (+4%)	4,072	881
private-kernel-inner	260	64,516	20,441
public-kernel-private-input	171 (-1%)	25,203	20,441
public-kernel-non-first-iteration	168 (-1%)	25,245	20,441
merge-rollup	10.8 (-3%)	2,592	873

Miscellaneous

Transaction sizes based on how many contracts are deployed in the tx.

Metric	0 deployed contracts	1 deployed contracts
tx_size_in_bytes	10,323	25,938