feat: Implement the Web Share Target API (#3230)

* Use the web share target API

* Make requested changes

* Remove line

* Add application/json back

* Add application/vnd.excalidraw+json

* Add 'POST' check back

* Make requested changes

* Update src/appState.ts

Co-authored-by: Thomas Steiner <tomac@google.com>

* Update test

* Override initializeScene

* Use Excalidraw MIME type

* Minor fixes

* More MIME type tweaks

* More permissive file open

* Be overpermissive in file open

Co-authored-by: Thomas Steiner <tomac@google.com>
Co-authored-by: tomayac <steiner.thomas@gmail.com>

package.json

@@ -27,7 +27,7 @@
     "@types/react": "17.0.2",
     "@types/react-dom": "17.0.1",
     "@types/socket.io-client": "1.4.35",
-    "browser-fs-access": "0.14.1",
+    "browser-fs-access": "0.14.2",
     "clsx": "1.1.1",
     "firebase": "8.2.10",
     "i18next-browser-languagedetector": "6.0.1",