feat(kdl): added kdl support

Author: derekbunch

README.md

@@ -146,7 +146,7 @@ Note: support for specific languages is strictly community maintained and can br
   - [ ] `json5`
   - [ ] `jsonc`
   - [ ] `jsx`
-  - [ ] `kdl`
+  - [x] `kdl`
   - [ ] `kotlin`
   - [ ] `lalrpop`
   - [ ] `ledger`

queries/kdl/context.scm

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+(node_children) @context

test/lang/test.kdl

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+// {{TEST}}
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+foo { // {{CONTEXT}}
+    bar { // {{CONTEXT}}
+        baz { // {{CONTEXT}}
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+            // {{CURSOR}}
+        }
+    }
+}
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+// {{TEST}}
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+bar { // {{CONTEXT}}
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+// {{CURSOR}}
+}