[Core] Tri Layer Keys (#19795)

Co-authored-by: wilba <[email protected]>
Co-authored-by: Pablo Martínez <[email protected]>
Co-authored-by: Joel Challis <[email protected]>
Co-authored-by: Nick Brassel <[email protected]>

data/constants/keycodes/keycodes_0.0.2_quantum.hjson

@@ -0,0 +1,18 @@
+{
+    "keycodes": {
+        "0x7C77": {
+            "group": "quantum",
+            "key": "QK_TRI_LAYER_LOWER",
+            "aliases": [
+                "TL_LOWR"
+            ]
+        },
+        "0x7C78": {
+            "group": "quantum",
+            "key": "QK_TRI_LAYER_UPPER",
+            "aliases": [
+                "TL_UPPR"
+            ]
+        }
+    }
+}