Add kick (remove) confirmation and reason (#4507)

* Add confirmation dialog when kicking someone, ith ability to provide a reason.

Also add the reason for banning people.

* Fix padding issue in dialogs.

* Improve TextField in dialog.

* Update screenshots

* Fix tests

* Format and import

* Add missing UI tests.

* Use `needsConfirmation` as it's already used in the code base.

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Co-authored-by: ElementBot <android@element.io>

libraries/matrix/test/src/main/kotlin/io/element/android/libraries/matrix/test/TestData.kt

@@ -63,6 +63,7 @@ const val A_MESSAGE = "Hello world!"
 const val A_REPLY = "OK, I'll be there!"
 const val ANOTHER_MESSAGE = "Hello universe!"
 const val A_CAPTION = "A media caption"
+const val A_REASON = "A reason"
 
 const val A_REDACTION_REASON = "A redaction reason"