[Feat] Send auth SMS code usecase

Created a usecase for sending verification SMS.
References #61.

server/services/user-service/src/usecases/send-authentication-sms-code.ts

@@ -0,0 +1,61 @@
+import {
+  SharedQueue,
+  SMSApi,
+  SMSVerificationInstance,
+} from '../../../core/@types/global';
+import config from '../../../core/config';
+
+
+/**
+ * Sends a authentication SMS code.
+ *
+ * @export
+ * @param {{
+ *   smsApi: SMSApi,
+ *   sharedQueue: SharedQueue,
+ * }} {
+ *   smsApi,
+ *   sharedQueue,
+ * } - dependency injection
+ * @return {Function}
+ */
+export default function buildSendAuthenticationSmsCode({
+  smsApi,
+  sharedQueue,
+}: {
+  smsApi: SMSApi;
+  sharedQueue: SharedQueue;
+}): Function {
+  return async function sendAuthenticationSmsCode(phoneNumber: string) {
+    // Internal parameter
+    let verificationInstance: SMSVerificationInstance;
+
+    // Emitting an 'USER_INVALID_NUMBER' event in shared queue on invalid number
+    try {
+      // Sending verification code
+      verificationInstance = await smsApi.sendCode(
+          phoneNumber,
+          'sms',
+      );
+    } catch (e) {
+      sharedQueue.emit([
+        config.inboundLoggerServiceQueue,
+      ], {
+        subject: 'USER_INVALID_NUMBER',
+        body: {phoneNumber: phoneNumber, error: e.message},
+      });
+      return;
+    }
+
+    // Emitting an 'USER_SMS_SEND' event in shared queue on valid number
+    sharedQueue.emit([
+      config.inboundDeliveryServiceQueue,
+      config.inboundLoggerServiceQueue,
+    ], {
+      subject: 'USER_SMS_SEND',
+      body: {phoneNumber: phoneNumber},
+    });
+
+    return verificationInstance;
+  };
+}