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/tests/packages/__snapshots__/utils.test.ts.snap

@@ -32,7 +32,6 @@ Object {
   "exportWithDarkMode": false,
   "fileHandle": null,
   "gridSize": null,
-  "height": 768,
   "isBindingEnabled": true,
   "isLibraryOpen": false,
   "isLoading": false,
@@ -42,8 +41,6 @@ Object {
   "metadata": undefined,
   "multiElement": null,
   "name": "name",
-  "offsetLeft": 0,
-  "offsetTop": 0,
   "openMenu": null,
   "pasteDialog": Object {
     "data": null,
@@ -67,7 +64,6 @@ Object {
   "toastMessage": null,
   "viewBackgroundColor": "#ffffff",
   "viewModeEnabled": false,
-  "width": 1024,
   "zenModeEnabled": false,
   "zoom": Object {
     "translation": Object {