feat: Add the basic implementation of notification module (#7282)

* feat: Add the basic implementation of notification module

* fix: Minor fixes and introduction of idempotency key

* fix: Changes based on PR review

packages/modules/notification/jest.config.js

@@ -0,0 +1,21 @@
+module.exports = {
+  moduleNameMapper: {
+    "^@models": "<rootDir>/src/models",
+    "^@services": "<rootDir>/src/services",
+    "^@repositories": "<rootDir>/src/repositories",
+    "^@types": "<rootDir>/src/types",
+    "^@utils": "<rootDir>/src/utils",
+  },
+  transform: {
+    "^.+\\.[jt]s?$": [
+      "ts-jest",
+      {
+        tsconfig: "tsconfig.spec.json",
+        isolatedModules: true,
+      },
+    ],
+  },
+  testEnvironment: `node`,
+  moduleFileExtensions: [`js`, `ts`],
+  modulePathIgnorePatterns: ["dist/"],
+}