feat: add PathSeg to public API

This commit introduces the `PathSeg` enum to the public API in `lib.rs`.

src/lib.rs

@@ -411,7 +411,7 @@ pub use self::context::Context;
 pub use self::decorators::DecoratorDef;
 pub use self::error::{RenderError, RenderErrorReason, TemplateError, TemplateErrorReason};
 pub use self::helpers::{HelperDef, HelperResult};
-pub use self::json::path::Path;
+pub use self::json::path::{Path, PathSeg};
 pub use self::json::value::{to_json, JsonRender, JsonTruthy, PathAndJson, ScopedJson};
 pub use self::local_vars::LocalVars;
 pub use self::output::{Output, StringOutput};