chore: migrate rust/canister_logs to icp-cli

[marc0olo]

Summary

• Replaces dfx.json with icp.yaml using @dfinity/rust@v3.3.0 (backend-only, no package field needed)
• Moves src/lib.rs → backend/lib.rs; root Cargo.toml becomes a workspace with members = ["backend"]
• Upgrades Rust dependencies: ic-cdk 0.20, ic-cdk-timers 1.0, ic-cdk-management-canister 0.1.1
• Replaces removed ic_cdk::api::management_canister with ic_cdk_management_canister::raw_rand
• Adds Makefile with 11 numbered tests covering all public canister methods (print, print_query, trap, trap_query, panic, memory_oob, failed_unwrap, raw_rand, timer trap)
• Rewrites README with icp-cli deploy/test instructions, preserving key behavioral explanation (update vs. non-replicated query log recording)
• Adds rust-canister_logs CI job using icp-dev-env-rust:1.0.0 to the existing canister_logs.yml workflow
• Deletes: dfx.json, BUILD.md, poll_logs.sh, canister_logs.did, .devcontainer/devcontainer.json, package-lock.json

Test plan

• icp network start -d && icp deploy succeeds in rust/canister_logs
• make test passes all 11 tests locally
• CI rust-canister_logs job passes
• icp canister logs backend shows timer trap entries after 5 seconds
• icp canister logs --follow backend streams logs in real time
• Non-replicated query calls do NOT appear in canister logs (Tests 3 and 6)
• Intentionally-trapping calls (trap, panic, memory_oob, failed_unwrap) do appear in logs despite returning errors

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