Add onType rules similar to onEnter rules

[aiday-mar]

It may be useful to have onType rules similar to onEnter rules which look at the previous line text, the before range text and the after range text to determine whether to outdent the text when text is typed. The use case for this would be to outdent the { brackets when typed in the following case:

if (true)
    {}

This currently is fixed by outdenting the current line when the current line matches the increaseIndentationPattern and the previous line matches the indentNextLinePattern. This is however leading to some regressions like this : #224584