Added unit tests for handling key events in `processing:core` #79

Job	Run time
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Create Pull Request Build for linux (x64)	3m 3s
Create Pull Request Build for windows (x64)	8m 12s
Create Pull Request Build for macos (x64)	5m 3s
Create Pull Request Build for macos (aarch64)	2m 23s
	23m 6s

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