[FEAT] LSP column definitions in * hover

**Is your feature request related to a problem? Please describe.**
[slack thread](https://getdbt.slack.com/archives/C04BK717RD3/p1774894636749549)

When hovering over `*`, currently just the column names, types, and origin is rendered. Add in descriptions for each of the columns for additional context.

**Is your feature request related to a particular component of the dbt Fusion Engine**
- [ ] CLI Features
- [ ] Adapter or Database Driver Features
- [ ] SQL Understanding Features
- [x] VS Code extension

**Additional context**
Consider if adding descriptions creates clutter in the hover view and if it negatively impacts readability.