feat(behaviors): Add macro support.

* Fine grainted press/release/tap actions.
* TIming between actions can be controlled.
* Processed async, to avoid blocking.

app/dts/bindings/behaviors/zmk,behavior-macro.yaml

@@ -0,0 +1,21 @@
+# Copyright (c) 2022 The ZMK Contributors
+# SPDX-License-Identifier: MIT
+
+description: Macro Behavior
+
+compatible: "zmk,behavior-macro"
+
+include: zero_param.yaml
+
+properties:
+  bindings:
+    type: phandle-array
+    required: true
+  wait-ms:
+    type: int
+    default: 100
+    description: The default time to wait (in milliseconds) before triggering the next behavior in the macro bindings list.
+  tap-ms:
+    type: int
+    default: 100
+    description: The default time to wait (in milliseconds) between the press and release events on a tapped macro behavior binding