Reduce loading time - BERKELEY

[mitschabaude]

Berkeley version of #1073, plus merging main -> berkeley
Closes #1065

mina: MinaProtocol/mina#13878
bindings: o1-labs/o1js-bindings#119
snarky: o1-labs/snarky#829

Benchmark (node):

./run src/examples/benchmarks/import.ts

Time to import at various steps:

• e09772d: 1763ms - initial
• MinaProtocol/mina@8ee87dc: 1183ms - remove expensive poseidon param conversion
• MinaProtocol/mina@d232a0d: 1061ms - compute vk hash lazily
• MinaProtocol/mina@78de73e: 950ms - compute dummy tx lazily
• MinaProtocol/mina@7d9fa28: 877ms - compute Pickles dummy data lazily
• o1-labs/o1js-bindings@7e2696b: delay getting number of workers; only affects web (reduction by >100ms)
• afee400: 749ms - precompute and bundle hash prefix states instead of computing them at the top level
• latest: 585ms - avoid a bunch of other top level computation / avoid going through zarith when converting fields

Web flame graph of the first ~2 seconds, before:

Same flame graph after: