[Feature Request]: Add setting to show / hide / postfix the schema of items in Explorer window

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### Feature Description

Please add a setting to show / hide / postfix the schema of items in the Explorer window.

Instead of
> ∨ Tables
> ❯ 𝄜 dbo.Atable
> ❯ 𝄜 dbo.Btable
> ❯ 𝄜 dbo.Ctable

show:
> ∨ Tables
> ❯ 𝄜 Atable
> ❯ 𝄜 Btable
> ❯ 𝄜 Ctable

or show:
> ∨ Tables
> ❯ 𝄜 Atable (dbo)
> ❯ 𝄜 Btable (dbo)
> ❯ 𝄜 Ctable (dbo)

### Problem and Motivation

In the explorer window I want to type the beginning of a table or view name to navigate to it.
Right now I must type "dbo.BTab…" to do this, always starting with the schema and a dot.
Having these options made searching by typing much easier.

### Related Area

- [ ] Connection dialog (SQL Server | Azure browse/Fabric browse)
- [ ] Query editor
- [ ] Query results panel
- [x] 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

Start by tracing the Object Explorer entry point and how its item labels and extension settings are defined. Determine where schema-qualified names are rendered and how Explorer search uses them. Done means a setting supports showing, hiding, or postfixing schemas for tables and views, with typing navigation working for each option.

Written by the indexing model from the issue text.