refactor: refactor tool macros and router implementation (#261)

* refactor: refactor tool macros and router implementation

- Updated the `#[tool(tool_box)]` macro to `#[tool_router]` across various modules for consistency.
- Enhanced the `Calculator`, `Counter`, and `GenericService` structs to utilize `ToolRouter` for handling tool calls.
- Introduced `Parameters` struct for better parameter handling in tool functions.
- Added new methods for listing tools and calling tools in server handlers.
- Improved test cases to reflect changes in tool routing and parameter handling.
- Updated documentation and examples to align with the new router structure.

* fix: fix fmt and build error

* fix: fix test failure

* docs: documents for macros, fix ci

* fix: fix ci

* fix: fix wrongly replaced documents

* fix: remove useless file

* fix: change the parameter format for tool_router

* fix: update extract_doc_line to handle existing documentation and clean up unused code in server handler

* doc: update document for macro and examples

* doc: update readme and add contribute guide

* fix: fix type

crates/rmcp/README.md

@@ -15,20 +15,22 @@ wait for the first release.
 Creating a server with tools is simple using the `#[tool]` macro:
 
 ```rust, ignore
-use rmcp::{Error as McpError, ServiceExt, model::*, tool, transport::stdio};
+use rmcp::{Error as McpError, ServiceExt, model::*, tool, tool_router, transport::stdio, handler::server::tool::ToolCallContext, handler::server::router::tool::ToolRouter};
 use std::sync::Arc;
 use tokio::sync::Mutex;
 
 #[derive(Clone)]
 pub struct Counter {
     counter: Arc<Mutex<i32>>,
+    tool_router: ToolRouter<Self>,
 }
 
-#[tool(tool_box)]
+#[tool_router]
 impl Counter {
     fn new() -> Self {
         Self {
             counter: Arc::new(Mutex::new(0)),
+            tool_router: Self::tool_router(),
         }
     }
 
@@ -51,7 +53,7 @@ impl Counter {
 }
 
 // Implement the server handler
-#[tool(tool_box)]
+#[tool_handler]
 impl rmcp::ServerHandler for Counter {
     fn get_info(&self) -> ServerInfo {
         ServerInfo {