[Feature Request]: Add extented properties

### Feature Description

Show extended properties when hovering over with a mouse over a table or column within a SQL statement.
Add posibility to add or update an extended property (sp_addextendedproperty)

### Problem and Motivation

Currently, I need to go to a different documentation tool to understand column or table properties. That interrupts my workflow.

### Related Area

- [ ] Connection dialog (SQL Server | Azure browse/Fabric browse)
- [ ] Query editor
- [x] Query results panel
- [ ] Object Explorer
- [ ] GitHub Copilot integration
- [ ] Preview/Edit data
- [x] Table Designer
- [ ] Schema Designer
- [ ] Schema Compare
- [ ] Local SQL Server Container provisioning
- [ ] SQL database in Fabric provisioning
- [ ] DACPAC/BACPAC export/import
- [ ] SQL Database projects
- [ ] Query Plan Visualizer
- [ ] Other (please describe below)

### If you selected "Other", please describe the area

_No response_

### Confirmation

- [x] I have searched existing feature requests and couldn't find a match
- [ ] I want to help implement this feature

Start by tracing the query results panel and Table Designer entry points that handle table and column hover or property display. Determine how SQL Server extended properties are currently surfaced, then define the UI and database-operation paths needed to display them and support sp_addextendedproperty updates. Done means users can view and update extended properties without leaving the workflow.

Written by the indexing model from the issue text.