nfc: On-device tag generator (#1319)

* nfc: Add tag generator base
* nfc: Fix BCC generation
* nfc: Add MFUL EV1 generators
* nfc: Fix typos in generator
* nfc: Add NTAG21x generators
* nfc: More const
* nfc: Add NTAG I2C generators
* nfc: Add field names to generator initializers
* nfc: Move generators to add manually scene
* nfc: Revise tag generator UX
* nfc: Revert add manually menu item name
* nfc: Remove unused scene start submenu index

Co-authored-by: あく <alleteam@gmail.com>
Co-authored-by: gornekich <n.gorbadey@gmail.com>

applications/nfc/nfc_i.h

@@ -33,6 +33,9 @@
 #define NFC_SEND_NOTIFICATION_TRUE (1UL)
 #define NFC_TEXT_STORE_SIZE 128
 
+// Forward declaration due to circular dependency
+typedef struct NfcGenerator NfcGenerator;
+
 struct Nfc {
     NfcWorker* worker;
     ViewDispatcher* view_dispatcher;
@@ -55,6 +58,8 @@ struct Nfc {
     Widget* widget;
     BankCard* bank_card;
     DictAttack* dict_attack;
+
+    const NfcGenerator* generator;
 };
 
 typedef enum {