feat(rn,conference) show invite button on the top navbar

react/features/conference/components/native/NavigationBar.js

 import { getConferenceName } from '../../../base/conference';
 import { getFeatureFlag, CONFERENCE_TIMER_ENABLED, MEETING_NAME_ENABLED } from '../../../base/flags';
 import { connect } from '../../../base/redux';
+import InviteButton from '../../../invite/components/add-people-dialog/native/InviteButton';
 import { PictureInPictureButton } from '../../../mobile/picture-in-picture';
 import { isToolboxVisible } from '../../../toolbox/functions.native';
 import ConferenceTimer from '../ConferenceTimer';
             pointerEvents = 'box-none'
             style = { styles.navBarWrapper }>
             <View style = { styles.pipButtonContainer }>
-                <PictureInPictureButton
-                    styles = { styles.pipButton } />
+                <PictureInPictureButton styles = { styles.pipButton } />
             </View>
             <View
                 pointerEvents = 'box-none'
                 }
                 <Labels />
             </View>
+            <View style = { styles.inviteButtonContainer }>
+                <InviteButton styles = { styles.inviteButton } />
+            </View>
         </View>
     );
 };

react/features/conference/components/native/styles.js

 
 export const INSECURE_ROOM_NAME_LABEL_COLOR = ColorPalette.warning;
 
+const NAVBAR_BUTTON_SIZE = 24;
+
 /**
  * The styles of the feature conference.
  */
         flexDirection: 'row'
     },
 
+    inviteButtonContainer: {
+        paddingHorizontal: 10,
+        paddingVertical: 10,
+        position: 'absolute',
+        top: 0,
+        right: 0,
+        zIndex: 1
+    },
+
+    inviteButton: {
+        iconStyle: {
+            color: ColorPalette.white,
+            fontSize: NAVBAR_BUTTON_SIZE
+        },
+        underlayColor: 'transparent'
+    },
 
     lonelyButton: {
         alignItems: 'center',
     },
 
     pipButtonContainer: {
+        paddingHorizontal: 10,
+        paddingVertical: 10,
         position: 'absolute',
-        top: 10,
-        left: 5,
+        top: 0,
+        left: 0,
         zIndex: 1
     },
 
     pipButton: {
         iconStyle: {
             color: ColorPalette.white,
-            fontSize: 24
+            fontSize: NAVBAR_BUTTON_SIZE
         },
         underlayColor: 'transparent'
     },
     },
 
     roomNameWrapper: {
-        flexDirection: 'row'
+        flexDirection: 'row',
+        marginHorizontal: 35
     },
 
     /**