feat: slash command for changing connection

[andylokandy]

No description provided.

[Copilot]

Pull request overview

This PR adds the ability to switch REPL connection profiles via a new slash command, and refactors REPL runtime state to make the active connection and prompt mutable during a session.

Changes:

• Introduce ReplState to hold REPL runtime state (client, prompt, format, timer, connection name).
• Add /connection NAME subcommand to switch the active connection profile and update the prompt.
• Add a reedline Ctrl-C/Ctrl-D workaround to decide whether to clear the line or exit based on buffer contents.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
scopeql/src/repl/prompt.rs	Adds an accessor for the prompt’s current endpoint so it can be shown after switching.
scopeql/src/repl/entrypoint.rs	Refactors REPL to use ReplState, adds connection switching, and updates Ctrl-C/Ctrl-D behavior via host commands.
scopeql/src/repl/command.rs	Adds /connection subcommand and adjusts subcommand ordering/help definitions.
scopeql/src/config.rs	Renames connection type and adds helpers for default connection name and enumerating profiles.
scopeql/src/client/mod.rs	Updates client construction to accept the renamed connection config type.

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