add #log! query predicate (#1890)

This has proved useful as I struggle with treesitter queries. :)



## Checklist

- [-] I have added
[tests](https://www.cursorless.org/docs/contributing/test-case-recorder/)
- [-] I have updated the
[docs](https://github.com/cursorless-dev/cursorless/tree/main/docs) and
[cheatsheet](https://github.com/cursorless-dev/cursorless/tree/main/cursorless-talon/src/cheatsheet)
- [-] I have not broken the cheatsheet

Author: josharian

packages/cursorless-engine/src/languages/TreeSitterQuery/queryPredicateOperators.ts

@@ -161,6 +161,19 @@ class AllowMultiple extends QueryPredicateOperator<AllowMultiple> {
   }
 }
 
+/**
+ * A predicate operator that logs a node, for debugging.
+ */
+class Log extends QueryPredicateOperator<Log> {
+  name = "log!" as const;
+  schema = z.tuple([q.node]);
+
+  run(nodeInfo: MutableQueryCapture) {
+    console.log(`#log!: ${nodeInfo.name}@${nodeInfo.range}`);
+    return true;
+  }
+}
+
 /**
  * A predicate operator that sets the insertion delimiter of the match. For
  * example, `(#insertion-delimiter! @foo ", ")` will set the insertion delimiter
@@ -178,6 +191,7 @@ class InsertionDelimiter extends QueryPredicateOperator<InsertionDelimiter> {
 }
 
 export const queryPredicateOperators = [
+  new Log(),
   new NotType(),
   new NotEmpty(),
   new NotParentType(),