feat: Calculate width/height of canvas based on container dimensions (".excalidraw" selector) & remove props width & height (#3379)

* Remove width/height from the ".excalidraw" container so it will sized automatically.
* updated all ref calculation to ".excalidraw" instead of parent since now ".excalidraw" will get resized
* Remove props width/height as its not needed anymore.
* Resize handler is also not needed anymore.
* Position absolute canvas due to #3379 (comment)

* move css to style and remove one extra rerendering

* factor out mock logic for test

* set height, width so as to avoid unnecessary updates of regression snap

* better mock

* better type checking and omit width,height from getDefaultAppState and also restore

* revert

* default to window dimensions in constructor

* update docs

* update

* update

* tweaks

src/actions/types.ts

@@ -6,7 +6,10 @@ import { AppState, ExcalidrawProps } from "../types";
 export type ActionResult =
   | {
       elements?: readonly ExcalidrawElement[] | null;
-      appState?: MarkOptional<AppState, "offsetTop" | "offsetLeft"> | null;
+      appState?: MarkOptional<
+        AppState,
+        "offsetTop" | "offsetLeft" | "width" | "height"
+      > | null;
       commitToHistory: boolean;
       syncHistory?: boolean;
     }