Added unit tests for handling key events in `processing:core` #45

Job	Run time
Create Pull Request Build for linux (aarch64)	4m 34s
Create Pull Request Build for linux (x64)	2m 54s
Create Pull Request Build for windows (x64)	6m 5s
Create Pull Request Build for macos (x64)	7m 6s
Create Pull Request Build for macos (aarch64)	2m 32s
	23m 11s

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