feat: make policy length limits configurable per engine (#624)

- Add PolicyLengthConfig struct with max_col, max_file_bytes, and
  max_lines fields, replacing hardcoded constants in the lexer.
- Add Engine::set_policy_length_config and clear_policy_length_config
  to allow callers to override the default limits.
- Add Source::from_contents_with_limits and from_file_with_limits for
  direct Source construction with custom limits; existing from_contents
  and from_file signatures are preserved using defaults.
- Add tests for default rejection, custom limits, and engine plumbing.
- Add bindings for C, C++, Python, WASM/JS, Java, Ruby, C#, Go

bindings/wasm/Cargo.toml

@@ -42,6 +42,7 @@ regorus = { path  = "../..", default-features = false, features = ["arc", "rvm"]
 serde = { version = "1.0.219", features = ["derive"] }
 serde_json = "1.0.140"
 wasm-bindgen = "0.2.100"
+serde-wasm-bindgen = "0.6"
 # Specify uuid as a mandatory dependency so as to enable `js` feature which is now required
 # when targeting wasm32-unknown-unknown.
 uuid = { version = "1.15.1", default-features = false, features = ["v4", "fast-rng", "js"]}