test(canton): golden-test request ID hashing against TS/Daml

[Pessina]

Follow-up from PR #740.

Code:

mpc/chain-signatures/node/src/indexer_canton/request_id.rs

Lines 53 to 56 in 93c8e00

	/// TODO(test): golden-test against the TypeScript/Daml reference implementation.
	/// Generate expected request IDs from the TS canton-sig package with known
	/// event payloads, then assert this function produces identical outputs.
	pub fn compute_request_id(event: &SignBidirectionalRequestedEvent) -> anyhow::Result<[u8; 32]> {

Context: compute_request_id must match the TypeScript/Daml Canton reference implementation. Generate expected request IDs from the TS canton-sig package for known event payloads and assert the Rust implementation produces identical bytes.