feat: TappableSpan support (#8256)

* feat(android): clickable span

Initial support for clickable span on Android

* test: clickable-span test page

* remove console.log

* use _emit instead of notify

* rename clickable to tappable in Span

* updated NativeScript.api.md

* chore: fixing tslint errors

* chore: fixed witespacing

* moved and improved test page

* feat: tappable span iOS implementation

Co-authored-by: Eduardo Speroni <edusperoni@gmail.com>

api-reports/NativeScript.api.md

@@ -1936,14 +1936,18 @@ export class Span extends ViewBase {
 
     public fontWeight: FontWeight;
 
+    public static linkTapEvent: string;
+
     // (undocumented)
     _setTextInternal(value: string): void;
 
+    public readonly tappable: boolean;
+
     public text: string;
 
     public textDecoration: TextDecoration;
     //@endprivate
-}
+ }
 
 // @public
 export class StackLayout extends LayoutBase {
@@ -2422,7 +2426,7 @@ export interface TapGestureEventData extends GestureEventData {
     getPointerCount(): number;
 
     getX(): number;
-    
+
     getY(): number;
  }