feat(aztec.js)!: Move accounts out of aztec.js into new package

[spalladino]

Extracts account contract implementations and related classes, as well as the default base classes, to a new @aztec/accounts package. Updates docs to reference the new package, and includes it in the API ref.

This means that all scripts that relied on using accounts from the Sandbox, creating new accounts, or using accounts already deployed, will now need to import this package.

Since accounts is now needed along with aztec.js for most stuff, including web, this PR also adds a new build step for end-to-end tests to exercise web builds. Instead of building aztec.js via webpack as part of aztec.js, we create a new "web application" as part of the end-to-end tests, which includes both aztec.js and accounts, and test that. This flow should be closer to how end-users will interact with aztec.js on the web.

Fixes #3807

[AztecBot]

Benchmark results

No metrics with a significant change found.

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 88fcf8d3 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	222,984	868,316	3,449,312
l1_rollup_execution_gas	867,093	3,746,369	23,306,077
l2_block_processing_time_in_ms	1,381 (-9%)	5,142 (+1%)	21,302 (+2%)
note_successful_decrypting_time_in_ms	403 (+5%)	1,144 (+4%)	4,258 (+4%)
note_trial_decrypting_time_in_ms	109 (+16%)	38.6 (+10%)	143 (+5%)
l2_block_building_time_in_ms	14,912	59,248	237,738
l2_block_rollup_simulation_time_in_ms	10,592	42,043	169,583
l2_block_public_tx_process_time_in_ms	4,287	17,121 (+1%)	67,886

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	15,095 (-2%)	28,939 (+1%)
note_history_successful_decrypting_time_in_ms	2,678 (-4%)	5,456
note_history_trial_decrypting_time_in_ms	92.3 (-36%)	149 (-9%)
node_database_size_in_bytes	3,621,879	3,718,464
pxe_database_size_in_bytes	29,923	59,478

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	210	44,709	25,561
private-kernel-ordering	136	30,953	14,809
base-rollup	1,074	128,374	881
root-rollup	82.3 (-4%)	4,088	889
private-kernel-inner	286	71,236	25,561
public-kernel-private-input	202	31,891	25,561
public-kernel-non-first-iteration	200	31,933	25,561
merge-rollup	9.71	2,608	881

Miscellaneous

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

Metric	0 deployed contracts	1 deployed contracts
tx_size_in_bytes	15,487	31,878

[spalladino]

Heads up @AztecProtocol/devrel and @rahul-kothari on this upcoming breaking change, in case you want to delay it after next week's release.

[signorecello]

Thanks for the heads-up, my friend fully documented it so we should be good. Just to be sure I'll add this to migration guide

Also great devex change btw