Do we have a way to check if pen is charging on android? I see [Battery Status](https://github.com/NeoSmartpen/Android-SDK2.0/blob/451773d183368f1f22bd15a5f500b981aa4a8d0a/NASDK2.0_sample_code/NASDK_sample_code/src/main/java/kr/neolab/samplecode/Const.java#L43) for "battery level", but no variable for "battery is charging" (which we have for iOS as [PenSettingStruct.charging](https://github.com/NeoSmartpen/iOS-SDK3.0/blob/afb69158d47d8e7902e45e1429bdcc6e306cedf8/NISDK3/Classes/Model/ResponseStruct.swift#L462)).