Add dynamic route matching and validation improvements

Introduces dynamic route parameter support in route path computation and schema matching. Adds a utility for sending validation errors, updates schema definitions to support header validation, and refactors server middleware to handle header, body, and query validation with improved error handling. Also adds a placeholder user route and updates dependencies to include 'path-to-regexp'.

routes/users/[id].js

@@ -0,0 +1,8 @@
+const express = require("express")
+const router = express.Router()
+
+router.post("/", async (req, res, next) => {
+
+})
+
+module.exports = router