feat(magnetometer): add magnetometer wrapper (#3887)

* feat(magnetometer): add magnetometer wrapper

* fix(magnetomer): add wrapper parameters

Co-authored-by: Simone Colazzo <si.colazzo@reply.it>

src/@awesome-cordova-plugins/plugins/magnetometer/index.ts

@@ -0,0 +1,87 @@
+import { Injectable } from '@angular/core';
+import { Plugin, Cordova, AwesomeCordovaNativePlugin } from '@awesome-cordova-plugins/core';
+import { Observable } from 'rxjs';
+
+export interface MagnetometerReading {
+  /**
+   * X reading of magnetometer. (Number)
+   */
+  x: number;
+  /**
+   * Y reading of magnetometer. (Number)
+   */
+  y: number;
+  /**
+   * Z reading of magnetometer. (Number)
+   */
+  z: number;
+  /**
+   * Calculated total - always positive of magnetometer. (Number)
+   */
+  magnitude: number;
+}
+
+/**
+ * @name Device eMagnetometer
+ * @description
+ * Requires Cordova plugin: `cordova-plugin-magnetometer`. For more info, please see the [Device Orientation docs](https://github.com/sdesalas/cordova-plugin-magnetometer).
+ *
+ * @usage
+ * ```typescript
+ * // MagnetometerReading is an interface for compass
+ * import { Magnetometer, MagnetometerReading } from '@awesome-cordova-plugins/device-orientation/ngx';
+ *
+ * constructor(private magnetometer: Magnetometer) { }
+ *
+ * ...
+ *
+ * // Get the device current compass heading
+ * this.magnetometer.getReading().then(
+ *   (data: MagnetometerReading) => console.log(data),
+ *   (error: any) => console.log(error)
+ * );
+ *
+ * // Watch the device compass heading change
+ * var subscription = this.magnetometer.watchReadings().subscribe(
+ *   (data: MagnetometerReading) => console.log(data)
+ * );
+ *
+ * // Stop watching heading change
+ * subscription.unsubscribe();
+ * ```
+ * @interfaces
+ * MagnetometerReading
+ */
+@Plugin({
+  pluginName: 'Magnetometer',
+  plugin: 'cordova-plugin-magnetometer',
+  pluginRef: 'cordova.plugins.magnetometer',
+  repo: 'https://github.com/sdesalas/cordova-plugin-magnetometer',
+  platforms: ['Android', 'iOS'],
+})
+@Injectable()
+export class Magnetometer extends AwesomeCordovaNativePlugin {
+  /**
+   * Get the current compass reading.
+   * @returns {Promise<MagnetometerReading>}
+   */
+  @Cordova()
+  getReading(): Promise<MagnetometerReading> {
+    return;
+  }
+  /**
+   * Get the device current heading at a regular interval
+   *
+   * Stop the watch by unsubscribing from the observable
+   * @param {DeviceOrientationCompassOptions} [options] Options for compass. Frequency and Filter. Optional
+   * @returns {Observable<DeviceOrientationCompassHeading>} Returns an observable that contains the compass heading
+   */
+  @Cordova({
+    callbackOrder: 'reverse',
+    observable: true,
+    clearFunction: 'stop',
+  })
+  watchReadings(): Observable<MagnetometerReading> {
+    return;
+  }
+}