Feature: input processor behavior invocation (#2714)

refactor(pointing): Allow stopping event propagation

    Allow input processors to return a special value if a given input event
    should not be further processed/propagated.

feat(pointing): Add behavior input processor

    Add the ability to intercept certain input events and trigger behaviors
    when they occur.

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

app/dts/bindings/input_processors/zmk,input-processor-behaviors.yaml

@@ -0,0 +1,18 @@
+# Copyright (c) 2024, The ZMK Contributors
+# SPDX-License-Identifier: MIT
+
+description: Input Processor for invoking behaviors on certain events
+
+compatible: "zmk,input-processor-behaviors"
+
+include: ip_zero_param.yaml
+
+properties:
+  type:
+    type: int
+  codes:
+    type: array
+    required: true
+  bindings:
+    type: phandle-array
+    required: true