feat(unstable): add lint.plugins to config schema (#27982)

Not sure what our handling of unstable properties in `deno.json` is.
This PR adds it to the config schema.

---------

Signed-off-by: Marvin Hagemeister <[email protected]>
Co-authored-by: Bartek Iwańczuk <[email protected]>

Author: marvinhagemeister

cli/schemas/config-file.v1.json

@@ -292,6 +292,13 @@
             "type": "string"
           }
         },
+        "plugins": {
+          "type": "array",
+          "description": "UNSTABLE: List of plugins to load. These can be paths, npm or jsr specifiers",
+          "items": {
+            "type": "string"
+          }
+        },
         "rules": {
           "type": "object",
           "properties": {