Implement requestPermission API (#190)

* Implement requestPermission api

* Update example ios podfile

* Update example windows dependencies

* Update Readme and Changelog

* Resolve Ai Comments

* Improve bluetooth permission handling

* Update Readme

* Improve readme

---------

Co-authored-by: Foti Dim <foti@navideck.com>

test/ble_characteristic_test.dart

@@ -124,4 +124,9 @@ class _UniversalBleMock extends UniversalBlePlatformMock {
       {Duration? timeout}) async {
     return charValue ?? Uint8List(0);
   }
+
+  @override
+  Future<void> requestPermissions({bool withAndroidFineLocation = false}) {
+    throw UnimplementedError();
+  }
 }