Added unit tests for handling key events in `processing:core` #80

Job	Run time
Create Pull Request Build for linux (aarch64)	3m 38s
Create Pull Request Build for linux (x64)	3m 15s
Create Pull Request Build for windows (x64)	10m 45s
Create Pull Request Build for macos (x64)	5m 33s
Create Pull Request Build for macos (aarch64)	2m 23s
	25m 34s

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