Add guidance start/stop (#3770)
* Add guidance start/stop
* Add guidance start/stop to inpaint class
* Black formatting
* Add support for guidance for multicontrolnet
* Add inclusive end
* Improve design
* correct imports
* Finish
* Finish all
* Correct more
* make style
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Co-authored-by: Patrick von Platen <patrick.v.platen@gmail.com>
