feat(mouse): Add mouse move and scroll support (#2477)

* feat(mouse): Add mouse move and scroll support

    * Use Zephyr input subsystem for all pointers.
    * Input processors for modifying events, e.g. scaling, swapping
      codes, temporary (mouse) layers, etc.
    * Mouse move/scroll behaviors.
    * Infrastructure in place for physical pointer input devices.

* feat: Add input split support.

* docs: Add initial pointer docs.

---------

Co-authored-by: Cem Aksoylar <caksoylar@users.noreply.github.com>
Co-authored-by: Alexander Krikun <krikun98@gmail.com>
Co-authored-by: Robert U <urob@users.noreply.github.com>
Co-authored-by: Shawn Meier <ftc@users.noreply.github.com>
Co-authored-by: Chris Andreae <chris@andreae.gen.nz>
Co-authored-by: Anant Thazhemadam <47104651+thazhemadam@users.noreply.github.com>
Co-authored-by: Erik Tollerud <erik.tollerud@gmail.com>
Co-authored-by: Nicolas Munnich <98408764+Nick-Munnich@users.noreply.github.com>

docs/sidebars.js

@@ -39,6 +39,7 @@ module.exports = {
         "features/battery",
         "features/low-power-states",
         "features/encoders",
+        "features/pointing",
         "features/displays",
         "features/backlight",
         "features/underglow",
@@ -92,6 +93,22 @@ module.exports = {
         "keymaps/combos",
         "keymaps/conditional-layers",
         "keymaps/list-of-keycodes",
+        {
+          type: "category",
+          label: "Input Processors",
+          link: {
+            type: "doc",
+            id: "keymaps/input-processors/index",
+          },
+          collapsed: true,
+          items: [
+            "keymaps/input-processors/usage",
+            "keymaps/input-processors/scaler",
+            "keymaps/input-processors/transformer",
+            "keymaps/input-processors/code-mapper",
+            "keymaps/input-processors/temp-layer",
+          ],
+        },
       ],
     },
     {
@@ -110,6 +127,7 @@ module.exports = {
         "config/combos",
         "config/displays",
         "config/encoders",
+        "config/pointing",
         "config/keymap",
         "config/layout",
         "config/kscan",
@@ -137,6 +155,7 @@ module.exports = {
             "development/hardware-integration/shift-registers",
             "development/hardware-integration/encoders",
             "development/hardware-integration/soft-off-setup",
+            "development/hardware-integration/pointing",
           ],
         },
         {