Expose globalFilter match Ranges to use with CSS.Highlight()

[jamesnw]

I'm looking at adding CSS.Highlight() highlights for search matches in my table. To do this, you need to get all the Ranges for all the matches. I'm currently able to do this by walking the table after render and finding matches. This has several drawbacks-

1. It doesn't exactly match the table's global filtering options (case sensitivity, trimming, etc)
2. It finds matches in columns that aren't actively filtered on

It would be useful to have a way to retrieve ranges directly from the table instance to match how the table is filtering.

I'm also looping through data multiple times- first for the table filter, then for the highlights. I believe that the filtering logic intentionally returns after a single match, which likely shouldn't change. This means that a second loop through for the ranges is probably still needed.