[General]: v8 to v9 migration guide

[davidjerleke]

⭐ New features

• [Feat]: Scroll to snap that holds a specific slide #1043 - emblaApi.scrollToSlide()
• [Feat]: Add direction parameter to scrollToSnap & scrollToSlide #1091

💔 Breaking Changes

TODO: Show how to migrate with code

• [Feat]: Refactor watch options to watch handlers #1078
• [Feat]: Refactor events to lowercase #1083
• [Feat]: Scroll to snap that holds a specific slide #1043 - emblaApi.scrollTo() --> emblaApi.scrollToSnap()
• [Feat]: Rename snap index options and methods to achieve consistent naming #1087