feat: add resource benchmark for propose

[Buchi-Einstein]

Description

Add a resource consumption benchmark for propose_settlement in the treasury contract to track CPU/memory instruction counts and catch resource-cost regressions.

Changes

New benchmark module (COMEBACKHERE-contracts/contracts/treasury/src/benchmark.rs)

• bench_propose_settlement — measures CPU instructions and memory bytes for a single propose_settlement call, with loose upper-bound assertions
• bench_propose_settlement_deterministic — verifies that two sequential propose_settlement calls consume the same resources (determinism check)

Baseline snapshot

• COMEBACKHERE-contracts/contracts/treasury/resources/propose_settlement_baseline.json — committed baseline for future PRs to diff against

Wiring

• Added mod benchmark; to the treasury contract's test module so the benchmarks run as part of cargo test --workspace

Closes #182

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