EarlGrey 1.15 - UITextView notifications are not triggered when using replaceText

[Simon-Kaz]

I noticed that using replaceText on a UITextView field does not trigger the notifications. While looking at the source code for the replaceText, both UITextField and UIControl notifications are handled, but UITextView is not.

I created a PR (#771) with a sample test and initial implementation of the changes required, could you have a look at it and guide the PR? I'm not an iOS developer, would appreciate some feedback to get the change merged.