feat(behaviors): Add behavior metadata information.

* For upcoming ZMK studio work, make a set of rich metadata available
  to provide a friendly name for a behavior, and allow super flexible
  descriptions of the parameters the behaviors take.
* Add ability to validate a zmk_behavior_binding against
  the behavior metadata available.

app/dts/bindings/behaviors/behavior-metadata.yaml

@@ -0,0 +1,6 @@
+# Copyright (c) 2024 The ZMK Contributors
+# SPDX-License-Identifier: MIT
+
+properties:
+  display-name:
+    type: string

app/dts/bindings/behaviors/one_param.yaml

@@ -1,6 +1,8 @@
 # Copyright (c) 2020 The ZMK Contributors
 # SPDX-License-Identifier: MIT
 
+include: behavior-metadata.yaml
+
 properties:
   label:
     type: string

app/dts/bindings/behaviors/two_param.yaml

@@ -1,6 +1,8 @@
 # Copyright (c) 2020 The ZMK Contributors
 # SPDX-License-Identifier: MIT
 
+include: behavior-metadata.yaml
+
 properties:
   label:
     type: string

app/dts/bindings/behaviors/zero_param.yaml

@@ -1,6 +1,8 @@
 # Copyright (c) 2020 The ZMK Contributors
 # SPDX-License-Identifier: MIT
 
+include: behavior-metadata.yaml
+
 properties:
   label:
     type: string