feat: Add IsometricTile.data storage (#2879)

Add missing arbitrary data storage in `IsometricTile`s that exists on normal `Tile`s

CHANGELOG.md

@@ -15,6 +15,7 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 
 ### Added
 
+- Added arbitrary data storage in isometric tiles, `ex.IsometricTile.data` this brings it into feature parity with normal `ex.Tile.data`
 - New graphics events and hooks that allow you to hook into graphics drawing before or after any drawing transformations have been applied
   * `Actor.graphics.onPreTransformDraw` with the corresponding event `.on('pretransformdraw')`
   * `Actor.graphics.onPostTransformDraw` with the corresponding event `.on('posttransformdraw')`

src/engine/TileMap/IsometricMap.ts

@@ -124,6 +124,11 @@ export class IsometricTile extends Entity {
     return this.pos.add(vec(0, this.map.tileHeight / 2));
   }
 
+  /**
+   * Arbitrary data storage per tile, useful for any game specific data
+   */
+  public data = new Map<string, any>();
+
   /**
    * Construct a new IsometricTile
    * @param x tile coordinate in x (not world position)