CCID App: Refactor (#3808)

- Move iso7816 related code to its own folder
- Refactor Iso7816Callback into Iso7816Handler
- Created new file for CCID commands
- Renamed variables according to standard

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

applications/debug/ccid_test/iso7816/iso7816_atr.h

@@ -0,0 +1,6 @@
+#pragma once
+
+typedef struct {
+    uint8_t TS;
+    uint8_t T0;
+} Iso7816Atr;