Refactor steno and add STENO_PROTOCOL = [all|txbolt|geminipr] (#17065)

* Refactor steno into STENO_ENABLE_[ALL|GEMINI|BOLT]

* Update stenography documentation

* STENO_ENABLE_TXBOLT → STENO_ENABLE_BOLT

TXBOLT is a better name but BOLT is more consistent with the
pre-existing TX Bolt related constants, which all drop the "TX " prefix

* Comments

* STENO_ENABLE_[GEMINI|BOLT|ALL] → STENO_PROTOCOL = [geminipr|txbolt|all]

* Add note on lacking V-USB support

* Clear chord at the end of the switch(mode){send_steno_chord} block

* Return true if NOEVENT

* update_chord_xxx → add_xxx_key_to_chord

* Enable the defines for all the protocols if STENO_PROTOCOL = all

* Mention how to use `steno_set_mode`

* Set the default steno protocol to "all"

This is done so that existing keymaps invoking `steno_set_mode` don't
all suddenly break

* Add data driver equivalents for stenography feature

* Document format of serial steno packets

(Thanks dnaq)

* Add missing comma

quantum/keymap_extras/keymap_steno.h

@@ -89,3 +89,31 @@ enum steno_combined_keycodes {
     STN_COMB_MAX = STN_EU,
 };
 #endif
+
+#ifdef STENO_ENABLE_BOLT
+// TxBolt Codes
+#    define TXB_NUL 0
+#    define TXB_S_L 0b00000001
+#    define TXB_T_L 0b00000010
+#    define TXB_K_L 0b00000100
+#    define TXB_P_L 0b00001000
+#    define TXB_W_L 0b00010000
+#    define TXB_H_L 0b00100000
+#    define TXB_R_L 0b01000001
+#    define TXB_A_L 0b01000010
+#    define TXB_O_L 0b01000100
+#    define TXB_STR 0b01001000
+#    define TXB_E_R 0b01010000
+#    define TXB_U_R 0b01100000
+#    define TXB_F_R 0b10000001
+#    define TXB_R_R 0b10000010
+#    define TXB_P_R 0b10000100
+#    define TXB_B_R 0b10001000
+#    define TXB_L_R 0b10010000
+#    define TXB_G_R 0b10100000
+#    define TXB_T_R 0b11000001
+#    define TXB_S_R 0b11000010
+#    define TXB_D_R 0b11000100
+#    define TXB_Z_R 0b11001000
+#    define TXB_NUM 0b11010000
+#endif // STENO_ENABLE_BOLT