Add Path extractor

The extractor implementation is based on the [Axum path extractor](https://github.com/tokio-rs/axum/tree/main/axum/src/extract/path)

Change-type: minor

README.md

@@ -126,7 +126,7 @@ use serde::{Deserialize, Serialize};
 use std::collections::HashMap;
 
 // The state model
-#[derive(Serialize, Deserialize, Debug)]
+#[derive(Serialize, Deserialize, Debug, Clone)]
 struct State {
     counters: HashMap<String, i32>,
 }

src/error.rs

@@ -5,6 +5,9 @@ pub enum Error {
     #[error(transparent)]
     SerializationError(#[from] serde_json::error::Error),
 
+    #[error(transparent)]
+    FailedToDeserializePathParams(#[from] super::extract::PathDeserializationError),
+
     #[error(transparent)]
     PatchFailed(#[from] json_patch::PatchError),
 

src/extract/mod.rs

@@ -1,5 +1,7 @@
+mod path;
 mod target;
 mod view;
 
+pub use path::*;
 pub use target::*;
 pub use view::*;