feat: Allow layer behaviors to "lock" layers on (#2717)

* refactor(core)!: Allow layer behaviors to "lock" layers on

Co-authored-by: Cem Aksoylar <caksoylar@users.noreply.github.com>

* docs: Added documentation note on locking layers

Co-authored-by: Cem Aksoylar <caksoylar@users.noreply.github.com>

---------

Co-authored-by: Cem Aksoylar <caksoylar@users.noreply.github.com>

app/dts/behaviors/to_layer.dtsi

@@ -15,6 +15,7 @@
             compatible = "zmk,behavior-to-layer";
             #binding-cells = <1>;
             display-name = "To Layer";
+            locking;
         };
     };
 };

app/dts/behaviors/toggle_layer.dtsi

@@ -15,6 +15,7 @@
             compatible = "zmk,behavior-toggle-layer";
             #binding-cells = <1>;
             display-name = "Toggle Layer";
+            locking;
         };
     };
 };

app/dts/bindings/behaviors/zmk,behavior-momentary-layer.yaml

@@ -6,3 +6,8 @@ description: Momentary layer on press/release behavior
 compatible: "zmk,behavior-momentary-layer"
 
 include: one_param.yaml
+
+properties:
+  locking:
+    type: boolean
+    description: Whether to "lock" the layer active, preventing behaviors without the "locking" property from deactivating the layer

app/dts/bindings/behaviors/zmk,behavior-to-layer.yaml

@@ -6,3 +6,8 @@ description: To Layer
 compatible: "zmk,behavior-to-layer"
 
 include: one_param.yaml
+
+properties:
+  locking:
+    type: boolean
+    description: Whether to "lock" the layer active, preventing behaviors without the "locking" property from deactivating the layer

app/dts/bindings/behaviors/zmk,behavior-toggle-layer.yaml

@@ -10,9 +10,11 @@ include: one_param.yaml
 properties:
   toggle-mode:
     type: string
-    required: false
     default: "flip"
     enum:
       - "on"
       - "off"
       - "flip"
+  locking:
+    type: boolean
+    description: Whether to "lock" the layer active, preventing behaviors without the "locking" property from deactivating the layer