Index pattern creation UX: Split the form up into 3 forms

[ycombinator]

Taken from #9991 (comment):

I think we can break this form up into three distinct forms, to reduce its complexity from a UI perspective.

It looks like a user has three ways to create an index pattern:

Non-time-based

Time-field-based

Event-time-based

If we got rid of the "Index contains time-based events" and "Use event times to create index names" checkboxes, and replaced them with tabs, then we could surface each of the above forms individually. This could also make the logic within this view a bit simpler.

[cjcenizal]

Note: This can be reduced to 2 forms by #10444, and only 1 form by #10443

[cjcenizal]

Closing in favor of #10444