[JetBrains] Add a Setting for Open Tabs as Context

User problem to solve

Users need the flexibility to choose whether or not to send open tabs in their JetBrains IDE as context for Code Suggestions.

Proposal

1. Introduce a setting that allows users to enable or disable sending open tabs as context.
2. Name the setting: Send open tabs as context
3. Set the default state to true (enabled).
4. Add documentation to instruct users how to enable or disable the setting.

Further details

VS Code implementation can be found here.