Add command names for "Remove Spaces" and "Keep Extra Spaces"

Joshua Goinsrequested to merge
work/redstrate/remove-spaces-command into master

I want to be able to configure these options in a KTextEditor application. However, it's not possible through public API since any configurable config keys need an explicit command name.

This adds names for "Keep Extra Spaces" and "Remove Spaces" configuration options.

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