**What**
This PR adds core DataTable enhancements to support view configurations in the admin dashboard. This is part of a set of stacked PRs to add the feature to Medusa.
- Puts handlers in place to update the visible columns in a table and the order in which they appear.
- Adds a ViewPills component for displaying and switching between saved view configurations
- Integrated view configuration hooks (useViewConfigurations) with the DataTable
Note: Column drag-and-drop reordering and the column visibility UI controls are not included in this PR as they require additional UI library updates - which will come in the next PR.
Example of what this looks like with the feature flag turned on - note the view pills with "default" in the top. This will expand when the data table behavior adds configuration.
<img width="2492" height="758" alt="CleanShot 2025-08-13 at 2 31 35@2x" src="https://github.com/user-attachments/assets/ee770f1c-dae1-49da-b255-1a6d615789de" />
