Add Word Per Minute calculation feature (#8054)

* Add Word Per Minute calculation feature

* Fix copyright info

* Remove header from quantum.c, setup overloadable keycode inclusion for WPM, update docs

* Simplify logic for keycode filtering

* Adding link from summary to wpm_feature info

* Update docs/feature_wpm.md

Typo in function prototype example in docs

Co-Authored-By: James Young <18669334+noroadsleft@users.noreply.github.com>

* Add WPM transport via i2c

Co-authored-by: James Young <18669334+noroadsleft@users.noreply.github.com>

quantum/quantum.c

@@ -192,6 +192,12 @@ bool process_record_quantum(keyrecord_t *record) {
     }
 #endif
 
+#ifdef WPM_ENABLE
+    if (record->event.pressed) {
+	update_wpm(keycode);
+    }
+#endif
+
 #ifdef TAP_DANCE_ENABLE
     preprocess_tap_dance(keycode, record);
 #endif
@@ -645,6 +651,10 @@ void matrix_scan_quantum() {
     encoder_read();
 #endif
 
+#ifdef WPM_ENABLE
+  decay_wpm();
+#endif
+
 #ifdef HAPTIC_ENABLE
     haptic_task();
 #endif