feat: add components for external services (#376)

- Add sms and edit-sms component
- Add notification and edit-notification component
- Add email and edit-email component
- Add amazon-s3 and edit-amazon-s3 component

Fixes: #182 and Fixes: #183

src/app/system/external-services/sms/edit-sms/edit-sms.component.ts

@@ -0,0 +1,71 @@
+/** Angular Imports */
+import { Component, OnInit } from '@angular/core';
+import { ActivatedRoute, Router } from '@angular/router';
+import { FormGroup, FormBuilder, Validators } from '@angular/forms';
+
+/** Custom Services */
+import { SystemService } from 'app/system/system.service';
+
+/**
+ * Edit SMS Configuration Component.
+ */
+@Component({
+  selector: 'mifosx-edit-sms',
+  templateUrl: './edit-sms.component.html',
+  styleUrls: ['./edit-sms.component.scss']
+})
+export class EditSMSComponent implements OnInit {
+
+  /** SMS Configuration data */
+  smsConfigurationData: any;
+  /** SMS Configuration Form */
+  smsConfigurationForm: FormGroup;
+
+  /**
+   * Retrieves the SMS configuration data from `resolve`.
+   * @param {FormBuilder} formBuilder Form Builder.
+   * @param {SystemService} systemService Accounting Service.
+   * @param {ActivatedRoute} route Activated Route.
+   * @param {Router} router Router for navigation.
+   */
+  constructor(private formBuilder: FormBuilder,
+              private systemService: SystemService,
+              private route: ActivatedRoute,
+              private router: Router) {
+    this.route.data.subscribe((data: { smsConfiguration: any }) => {
+      this.smsConfigurationData = data.smsConfiguration;
+    });
+  }
+
+  /**
+   * Creates SMS configuration form.
+   */
+  ngOnInit() {
+    this.setSMSConfigurationForm();
+  }
+
+  /**
+   * Creates SMS configuration form.
+   */
+  setSMSConfigurationForm() {
+    this.smsConfigurationForm = this.formBuilder.group({
+      'host_name': [this.smsConfigurationData[0].value, Validators.required],
+      'port_number': [this.smsConfigurationData[1].value, Validators.required],
+      'end_point': [this.smsConfigurationData[2].value, Validators.required],
+      'tenant_app_key': [this.smsConfigurationData[3].value, Validators.required]
+    });
+  }
+
+  /**
+   * Submits the SMS configuration and updates the SMS configuration,
+   * if successful redirects to view SMS configuration.
+   */
+  submit() {
+    this.systemService
+      .updateExternalConfiguration('SMS', this.smsConfigurationForm.value)
+      .subscribe((response: any) => {
+        this.router.navigate(['../'], { relativeTo: this.route });
+      });
+  }
+
+}