feat: add panic tracking and logging with PanicTracker

- Implemented PanicTracker to log panics using tracing within a dedicated span.
- Introduced PanicInfo struct to capture panic details.
- Added tests for panic catching and hook restoration.

feat: implement token-bucket rate limiter

- Created RateLimiter to manage token consumption with configurable rates and burst capacity.
- Added methods for acquiring tokens and checking available tokens.
- Included tests for rate limiting behavior and token availability.

feat: add automatic retry with exponential backoff

- Developed retry function to handle transient errors with configurable retry strategies.
- Introduced RetryConfig for customizing retry behavior and jitter.
- Added tests for various retry scenarios and error handling.

feat: implement graceful shutdown coordination

- Created ShutdownManager to manage shutdown signals and task completion.
- Introduced ShutdownSignal for tasks to observe shutdown requests.
- Added tests for shutdown request handling and task draining.

feat: add timeout functionality for async operations

- Implemented with_timeout function to enforce execution time limits on futures.
- Created Timeout struct for wrapping futures with a deadline.
- Added tests for timeout behavior and error mapping.

crates/corex-config/Cargo.toml

@@ -0,0 +1,42 @@
+[package]
+name = "corex-config"
+version = "0.1.0"
+edition = "2021"
+rust-version = "1.75"
+license = "MIT OR Apache-2.0"
+repository = "https://github.com/asepharyana/mytheclipse"
+homepage = "https://github.com/asepharyana/mytheclipse"
+documentation = "https://docs.rs/corex-config"
+authors = ["asepharyana <superaseph@gmail.com>"]
+description = "Type-safe, dynamic configuration engine: load .env/YAML/JSON/TOML into typed structs with hot-reload and validation."
+readme = "README.md"
+keywords = ["config", "env", "yaml", "json", "hot-reload"]
+categories = ["config", "development-tools"]
+
+[features]
+default = ["env", "yaml", "toml", "hot-reload"]
+# Load .env files + environment variables.
+env = ["dep:dotenvy"]
+# Parse structured files. JSON support (`.json`) is always available since
+# `serde_json::Value` is also the loader's internal merge representation.
+yaml = ["dep:serde_yaml"]
+toml = ["dep:toml"]
+# Watch config files and hot-reload.
+hot-reload = ["dep:notify", "dep:tokio"]
+
+[dependencies]
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+tracing = "0.1"
+
+# Optional loaders
+dotenvy = { version = "0.15", optional = true }
+serde_yaml = { version = "0.9", optional = true }
+toml = { version = "0.8", optional = true }
+# Hot-reload file watching
+notify = { version = "6", optional = true }
+tokio = { version = "1.53", features = ["sync", "rt", "time"], optional = true }
+
+[dev-dependencies]
+tokio = { version = "1.53", features = ["full"] }
+tempfile = "3"