feat: bump to wasi-sdk 20 compatible barretenberg

[charlielye]

Description

• Attempting to get rid of primitives.wasm as it's just one more thing to maintain. Currently just copies barretenberg.wasm to where primitivies.wasm was.
• Bump up wasi to 20 from 12.
• Stop using totally broken CRS stuff in favour of global crs.
• Initialize wasi 20 c runtime properly after loading wasm.

TODO:

• Call srs_init to init global srs!

Checklist:

• I have reviewed my diff in github, line by line.
• Every change is related to the PR description.
• I have linked this pull request to the issue(s) that it resolves.
• There are no unexpected formatting changes, superfluous debug logs, or commented-out code.
• The branch has been merged or rebased against the head of its merge target.
• I'm happy for the PR to be merged at the reviewer's next convenience.

[ludamad]

just periodically peeking
"Step 10/12 : COPY --from=builder /usr/src/circuits/cpp/build-wasm/bin/aztec3-circuits.wasm /usr/src/circuits/cpp/build-wasm/bin/aztec3-circuits.wasm
---> 51e0f6bc0714
Step 11/12 : COPY --from=builder /usr/src/circuits/cpp/barretenberg/cpp/build-wasm/bin/barretenberg.wasm /usr/src/circuits/cpp/barretenberg/cpp/build-wasm/bin/primitives.wasm
COPY failed: stat usr/src/circuits/cpp/barretenberg/cpp/build-wasm/bin/barretenberg.wasm: file does not exist
Terminating spot instance.."
Looks like we could just copy circuits wasm until we get rid of this entirely

[codygunton]

Note: c2ad78a was giving a bad alloc error on the private kernel circuit deposit test when run locally, but the error didn't show up in CI 😕

[ludamad]

Merged here so I can update with master