Support late token initialization (#537)

* support late token initialization

* force ci

Author: Guardiola31337

mapbox/libandroid-telemetry/src/main/java/com/mapbox/services/android/telemetry/Experimental.java

@@ -0,0 +1,19 @@
+package com.mapbox.services.android.telemetry;
+
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * An experimental user-facing API. Experimental APIs are quickly evolving
+ * and might change or be removed in minor versions.
+ * <p>
+ * Inspired by org.apache.spark.annotation.Experimental
+ */
+@Retention(RetentionPolicy.RUNTIME)
+@Target( {ElementType.TYPE, ElementType.FIELD, ElementType.METHOD, ElementType.PARAMETER,
+  ElementType.CONSTRUCTOR, ElementType.LOCAL_VARIABLE, ElementType.PACKAGE})
+@interface Experimental {
+}

mapbox/libandroid-telemetry/src/main/java/com/mapbox/services/android/telemetry/MapboxTelemetry.java

@@ -660,4 +660,23 @@ private void shutdownTelemetry() {
       timer = null;
     }
   }
+
+  /**
+   * Set the access token, for internal use only.
+   * <p>
+   * This is an experimental API. Experimental APIs are quickly evolving and
+   * might change or be removed in minor versions.
+   *
+   * @param accessToken the new access token
+   */
+  @Experimental
+  public void setAccessToken(@NonNull String accessToken) {
+    if (client == null || TextUtils.isEmpty(accessToken)) {
+      throw new TelemetryException(
+        "Please, make sure you have initialized MapboxTelemetry before resetting the access token and it's a valid one."
+          + " For more information, please visit https://www.mapbox.com/android-sdk.");
+    }
+    this.accessToken = accessToken;
+    client.setAccessToken(accessToken);
+  }
 }