[Feature Request]: Add setting to disable automatic bracket-wrapping of reserved words in IntelliSense completions

### Feature Description

A setting to disable automatic bracket-wrapping of reserved words when inserting IntelliSense completions, so the raw identifier is inserted instead.

### Problem and Motivation

When accepting an IntelliSense completion for a T-SQL reserved word used as a column name (e.g. type, name, value), the extension wraps it in square brackets — producing [type] rather than type. This is unhelpful when querying a schema that uses unbracketed identifiers, as it adds noise.

A secondary issue: bracket-wrapped identifiers are not highlighted consistently with their unbracketed equivalents (e.g. o.type is coloured as a column name; o.[type] is not). This appears related to #726, marked as fixed in v1.10.1.

Current workaround: Dismiss IntelliSense with Escape and type the identifier manually, or disable editor.quickSuggestions for SQL entirely.

Extension version: 1.41.0
VS Code version: 1.115.0

### Related Area

- [ ] Connection dialog (SQL Server | Azure browse/Fabric browse)
- [x] Query editor
- [ ] Query results panel
- [ ] Object Explorer
- [ ] GitHub Copilot integration
- [ ] Preview/Edit data
- [ ] 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

No files or tests are named. Start in the query editor's IntelliSense completion flow and trace how reserved words are inserted; done means a setting can disable square-bracket wrapping so the raw identifier is inserted.

Written by the indexing model from the issue text.