Add support for `Space` and `Plus` keywords

[laserlemon]

It seems that the eventToHotkeyString function returns " " for a spacebar keystroke, as described in the key values docs. But the expandHotkeyToEdges function also uses the space character to split hotkey combinations.

So how might one define a single hotkey or hotkey combination containing a space?

We might consider a slight deviation from the key values docs in this instance to add the Space shorthand as an alias for " " when defining a hotkey via the data-hotkey attribute or install function. Thank you! 💛

[theinterned]

Maybe we could use "Space" as a way to distinguish space as a separator of key sequences (" "), and the literal space key as a shortcut ("Space").

So for example the shortcut key to open Spotlight / Alfred / Raycast on a Mac would be "Meta+Space".

[theinterned]

This actually relates to #54 (comment) where I suggest we match on event.code rather than event.key. The event.key for space is " ": the event.code is "Space", so making that breaking change would also resolve this issue.

If we don't make that change, then this would require some special code.

[iansan5653]

Updated this issue to also cover Plus (because Mod++ isn't great).

[iansan5653]

Typo prevented this from properly closing when it was merged. It was released in 2.3.0