Allow image pasting in rich text mode in RTE (#11049)

* add comments to rough first solution

* allow eventRelation prop to pass to both composers

* use eventRelation in image paste

* add image pasting to rich text mode of rich text editor

* extract error handling to function

* type the error handler

* add tests

* make behaviour mimic SendMessage

* add sad path tests

* refactor to use catch throughout

* update comments

* tidy up tests

* add special case and change function signature

* add comment

* bump rte to 2.2.2

package.json

@@ -61,7 +61,7 @@
     "dependencies": {
         "@babel/runtime": "^7.12.5",
         "@matrix-org/analytics-events": "^0.5.0",
-        "@matrix-org/matrix-wysiwyg": "^2.0.0",
+        "@matrix-org/matrix-wysiwyg": "^2.2.2",
         "@matrix-org/react-sdk-module-api": "^0.0.5",
         "@sentry/browser": "^7.0.0",
         "@sentry/tracing": "^7.0.0",