[codex] add contract performance profiling

[Flamki]

Closes #354

Summary

• add a reusable contract profiler for compiled Soroban WASM artifacts
• profile estimated execution time, CPU gas, instruction hot spots, memory pressure, and bottlenecks
• compare a candidate profile against a saved JSON baseline and flag >10% gas/time/memory regressions
• generate JSON reports plus an optional HTML performance dashboard from starforge advanced-perf profile
• document profiling, dashboard, and baseline workflows in the benchmark and command docs

Validation

• rustfmt --edition 2021 --check src/utils/contract_profiler.rs src/commands/perf.rs

Notes

• cargo fmt is currently blocked by pre-existing syntax issues in src/utils/horizon.rs and src/commands/gas.rs.
• cargo test contract_profiler --lib could not complete locally because the checkout exhausted disk space while compiling dependencies before crate tests ran. The generated target directory was removed afterward and no generated files are included.

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