feat: export directives with Directive suffix

BREAKING CHANGE: The Resizable import is now ResizableDirective and ResizeHandle is now
ResizeHandleDirective

src/index.ts

@@ -2,7 +2,5 @@ export * from './resizable.module';
 export { BoundingRectangle } from './interfaces/bounding-rectangle.interface';
 export { Edges } from './interfaces/edges.interface';
 export { ResizeEvent } from './interfaces/resize-event.interface';
-export { ResizableDirective as Resizable } from './resizable.directive';
-export {
-  ResizeHandleDirective as ResizeHandle
-} from './resize-handle.directive';
+export { ResizableDirective } from './resizable.directive';
+export { ResizeHandleDirective } from './resize-handle.directive';