[Bug] Can't handle exceptions

[Holofox]

The package suppresses all exceptions that may occur while working with the camera. This is not correct because it is not possible to handle the denial of permission to access the camera and any other exception that is thrown.

Take a look at the following pieces of code:

flutter_wechat_camera_picker/lib/src/widget/camera_picker.dart

Lines 537 to 539 in 8212532

	} on CameraException catch (e) {
	realDebugPrint('CameraException: $e');
	} finally {

flutter_wechat_camera_picker/lib/src/widget/camera_picker.dart

Lines 575 to 577 in 8212532

	} catch (e) {
	realDebugPrint('Error when switch flash mode: $e');
	}

I gave as an example, in fact, there are more such places.

[AlexV525]

Thanks for the feedback. If you're able to submit a PR for this, I'll be happy to help you land an enhancement, since I'm quite busy in some other works.