Git actions for CI/CD

[acmshanyi]

1. CI/CD github actions
2. better tests

[Copilot]

Pull request overview

This PR adds GitHub Actions CI coverage for formatting, clippy, tests, sanitizers, and shuttle tests, while also updating test/runtime compatibility around rand and fixing a couple of correctness/cleanup issues.

Changes:

• Adds a new CI workflow for Rust formatting, clippy, fuzz crate build checks, normal tests, ASan tests, and shuttle concurrency tests.
• Updates RNG handling for shuttle/non-shuttle test compatibility and refreshes rand-related lockfile entries.
• Fixes MappingTable drop accounting and frees transient inner nodes during snapshot recovery validation.

Reviewed changes

Copilot reviewed 7 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
.github/workflows/ci.yaml	Adds CI jobs for formatting, linting, building, sanitizer tests, and shuttle tests.
Cargo.toml	Bumps the root crate version to 0.5.4.
benchmark/Cargo.lock	Refreshes dependency resolution, including rand updates, but leaves the path dependency version stale.
fuzz/Cargo.lock	Refreshes dependency resolution, including rand updates, but leaves the path dependency version stale.
src/utils/mod.rs	Adds a shuttle-compatible RNG wrapper exposing random_range.
src/utils/mapping_table.rs	Fixes initialized record count used during Drop.
src/tests/concurrent.rs	Adds a cfg-aware random range macro for rand API compatibility.
src/storage.rs	Simplifies the snapshot manager import.
src/snapshot.rs	Frees transient inner nodes during recovery validation and adjusts shuttle scheduler settings.