New feature: DYNAMIC_TAPPING_TERM_ENABLE (#11036)

* New feature: `DYNAMIC_TAPPING_TERM_ENABLE`

3 new quantum keys to configure the tapping term on the fly.

* Replace sprintf call in tapping_term_report by get_u16_str

* Replace tab with 4 spaces

quantum/quantum.c

@@ -275,6 +275,9 @@ bool process_record_quantum(keyrecord_t *record) {
 #ifdef AUTO_SHIFT_ENABLE
             process_auto_shift(keycode, record) &&
 #endif
+#ifdef DYNAMIC_TAPPING_TERM_ENABLE
+            process_dynamic_tapping_term(keycode, record) &&
+#endif
 #ifdef TERMINAL_ENABLE
             process_terminal(keycode, record) &&
 #endif