Expose REPL Settings (#37927)

Closes #37829

This PR introduces and exposes `REPLSettings` to control the number of
lines and columns in the REPL. These settings are integrated into the
existing configuration system, allowing for customization and management
through the standard settings interface.

#### Changes
- Added `REPLSettings` struct with `max_number_of_lines` and
`max_number_of_columns` fields.
- Integrated `REPLSettings` with the settings system by implementing the
`Settings` trait.
- Ensured compatibility with the workspace and existing settings
infrastructure.

Release Notes:

- Add configuration "repl" to settings to configure max lines and
columns for repl.

---------

Co-authored-by: Marshall Bowers <git@maxdeviant.com>
Co-authored-by: Kirill Bulatov <kirill@zed.dev>

assets/settings/default.json

@@ -1844,6 +1844,15 @@
     //    "typescript": "deno"
     // }
   },
+  // Repl settings.
+  "repl": {
+    // Maximum number of columns to keep in REPL's scrollback buffer.
+    // Clamped with [20, 512] range.
+    "max_columns": 128,
+    // Maximum number of lines to keep in REPL's scrollback buffer.
+    // Clamped with [4, 256] range.
+    "max_lines": 32
+  },
   // Vim settings
   "vim": {
     "default_mode": "normal",