Adding run targeting to text value ranges!

Ability to target an individual run with the modifier range:
<img width="1577" alt="CleanShot 2023-07-24 at 16 25 12@2x" src="https://github.com/rive-app/rive/assets/454182/48bca39b-057c-4ed5-b04e-cada62c1f190">

Diffs=
215d11c86 Adding run targeting to text value ranges! (#5660)