Make push with passProps type safe (#4223)

lib/src/Navigation.ts

   /**
    * Push a new layout into this screen's navigation stack.
    */
-  public push(componentId: string, layout: Layout): Promise<any> {
+  public push<P>(componentId: string, layout: Layout<P>): Promise<any> {
     return this.commands.push(componentId, layout);
   }
 

lib/src/interfaces/Layout.ts

 import { Options, OptionsSplitView } from './Options';
 
-export interface LayoutComponent {
+export interface LayoutComponent<P = {}> {
   /**
    * Component reference id, Auto generated if empty
    */
   /**
    * Properties to pass down to the component
    */
-  passProps?: object;
+  passProps?: P;
 }
 
 export interface LayoutStackChildren {
   overlays?: any;
 }
 
-export interface Layout {
+export interface Layout<P = {}> {
   /**
    * Set the component
    */
-  component?: LayoutComponent;
+  component?: LayoutComponent<P>;
   /**
    * Set the stack
    */