[Windows] Implementing Folder Picker support#380

vonovak merged 3 commits into

react-native-documents:masterreact-native-documents/document-picker:masterfrom

pradeepgsd:Windows]-Implimenting-Folder-picker-launch-capability-for-Windows-pradeepgsd/react-native-document-picker:Windows]-Implimenting-Folder-picker-launch-capability-for-Windows-Copy head branch name to clipboard