[mempool] Use Stream instead of Build + Prefetch Mempool Txs/State + Batch IsRepeat

[patrick-ogrady]

Resolves: #249

Testing (10k accounts, 500k txs, M2 Max)

Before [main] (~86856 TPS)

[1] block generation {"t": "5.646185875s", "avg(ms)": 115, "tps": 88555.35596408256}
[2] block generation {"t": "5.6602125s", "avg(ms)": 113, "tps": 88335.90611659898}
[3] block generation {"t": "5.770886625s", "avg(ms)": 117, "tps": 86641.7991706777}
[4] block generation {"t": "5.646529958s", "avg(ms)": 115, "tps": 88549.95966002098}
[5] block generation {"t": "6.082898417s", "avg(ms)": 124, "tps": 82197.65738691934}

After (~108493 TPS) => ~24.9% boost in build TPS 🎉

[1] block generation {"t": "4.482730875s", "avg(ms)": 91, "tps": 111539.1519014623}
[2] block generation {"t": "4.759061083s", "avg(ms)": 95, "tps": 105062.74058680747}
[3] block generation {"t": "4.592278459s", "avg(ms)": 93, "tps": 108878.41503167001}
[4] block generation {"t": "4.618432834s", "avg(ms)": 94, "tps": 108261.83209141805}
[5] block generation {"t": "4.598757792s", "avg(ms)": 93, "tps": 108725.01284364228}

TODO

• Build -> Top
• Remove account purging (avoid iteration and just wait for cleanup naturally)

[patrick-ogrady]

(before interleaving fetch with execute but with leases)

[patrick-ogrady]

Values here aren't directly comparable because load is slightly different between runs

Before

[08-12|11:26:47.069] INFO load/load_test.go:325 block generation {"t": "6.026229334s", "avg(ms)": 122, "tps": 82970.62263777432}

After

[08-12|11:28:58.212] INFO load/load_test.go:325 block generation {"t": "4.572423958s", "avg(ms)": 93, "tps": 109351.18978308879}```