Add basic error handling

+ Add express-async-errors package to handle async errors
+ Add ForwaradableError class (Base class for all project-specific errors)
+ Add defaultErrorHandler middleware which handles errors and sends info to the client

src/Middleware/error/ForwardableError.ts

@@ -0,0 +1,16 @@
+export default class ForwardableError extends Error {
+  // If in different context
+  private readonly __id = "CUSTOM_ERROR";
+
+  public readonly status: number;
+
+  constructor(status: number, message: string) {
+    super(message);
+
+    this.status = status;
+  }
+
+  static isForwardableError(error: any): error is ForwardableError {
+    return error.__id === "CUSTOM_ERROR";
+  }
+}