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 <[email protected]>

* Add WPM transport via i2c

Co-authored-by: James Young <[email protected]>

quantum/quantum.h

@@ -178,6 +178,10 @@ extern layer_state_t layer_state;
 #    include "via.h"
 #endif
 
+#ifdef WPM_ENABLE
+#    include "wpm.h"
+#endif
+
 // Function substitutions to ease GPIO manipulation
 #if defined(__AVR__)
 typedef uint8_t pin_t;