Fire workspace comment resize events

[BeksOmega]

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Problem

Currently we don't do this and it wasn't planned, but it might be nice to fire resize events for workspace comments. Main use-case being RTC

Request

Fire an event with the old size and the new size of the workspace comments after a resize.

Alternatives considered

No response

Additional context

No response

[maribethb]

@johnnesky this is the issue in core to fire resize events for workspace comments if you're interested

[johnnesky]

Thanks. Related to RaspberryPiFoundation/blockly-samples#2330