feat: add auth exmaple and fix auth middleware verify logic

Author: dancixx

Cargo.toml

@@ -71,6 +71,10 @@ name = "tako"
 path = "src/lib.rs"
 doctest = false
 
+[[example]]
+name = "auth"
+path = "examples/auth/src/main.rs"
+
 [[example]]
 name = "hello-world"
 path = "examples/hello-world/src/main.rs"