feat: replace custom mcp-types crate with equivalents from rmcp

.github/workflows/rust-ci.yml

@@ -64,8 +64,6 @@ jobs:
           components: rustfmt
       - name: cargo fmt
         run: cargo fmt -- --config imports_granularity=Item --check
-      - name: Verify codegen for mcp-types
-        run: ./mcp-types/check_lib_rs.py
 
   cargo_shear:
     name: cargo shear