TCA8418 initial config + basic 3x4 keypad config (#6422)

* TCA8418 with base config for 3x4 keypad

* replaced k with uppercase K

* change detection method

* reflect changes  #6381

---------

Co-authored-by: Ben Meadors <benmmeadors@gmail.com>

src/input/kbI2cBase.h

@@ -3,6 +3,7 @@
 #include "BBQ10Keyboard.h"
 #include "InputBroker.h"
 #include "MPR121Keyboard.h"
+#include "TCA8418Keyboard.h"
 #include "Wire.h"
 #include "concurrency/OSThread.h"
 
@@ -21,5 +22,6 @@ class KbI2cBase : public Observable<const InputEvent *>, public concurrency::OST
 
     BBQ10Keyboard Q10keyboard;
     MPR121Keyboard MPRkeyboard;
+    TCA8418Keyboard TCAKeyboard;
     bool is_sym = false;
 };