feat(benchmarks): add GasTrace qualitative gas profiler

[ukint-vs]

Summary

Adds GasTrace — a reply-linked message-tree reconstructor for gtest::BlockRunResult — to awesome-sails-benchmarks. It is the qualitative counterpart to the existing MeasureGas / BenchStorage quantitative tools: where MeasureGas answers how much gas?, GasTrace answers where did the gas go?

• GasTrace builder merges logs and gas_burned across one or more blocks, groups replies by reply_to, surfaces events as top-level entries, and renders a gas-annotated ASCII tree via Display.
• MethodRegistry resolves (InterfaceId, entry_id) pairs back to Service::method names using ServiceMeta::{INTERFACE_ID, METHODS}.
• gtest's block.log() surfaces replies and events but not the originating request — GasTrace synthesizes a root for any gas_burned entry whose id isn't represented in the tree and nests its reply under it, so gas attribution isn't silently dropped.
• Gated on the existing gtest feature — zero impact when disabled.

Example output

[0x1001..abcd] alice -> MyProgram::MyService::increment  12,400 gas
  `-- [0x1002..9876] [reply] Ok  - gas
[event] MyProgram
Total: 12,400 gas | 3 messages | depth 1

Limitations (documented)

Cross-program sub-calls (A → B → C) appear as separate roots because gtest::CoreLog doesn't expose parent-message causality. This is a gtest runtime constraint, not a tool design choice.

Base branch

Based on feat/awesome-sails-beta (which bumps to sails-rs = 1.0.0-beta.3) — gas_trace needs SailsMessageHeader, InterfaceId, MethodMetadata, ServiceMeta::{INTERFACE_ID, METHODS}, all of which are first published in the 1.0 beta line.

Test plan

• cargo check -p awesome-sails-benchmarks (default features)
• cargo check -p awesome-sails-benchmarks --no-default-features (gating verified)
• cargo check -p awesome-sails-benchmarks --features cli (bench-analyzer still builds)
• cargo test -p awesome-sails-benchmarks trace::tests — 16/16 unit tests pass
• cargo test --release -p awesome-sails-benchmarks -- --include-ignored — 27/27 pass (incl. integration demo against access-control-test-app)
• cargo clippy -p awesome-sails-benchmarks --all-targets --all-features -- -D warnings — clean
• cargo fmt --all --check — clean

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