[FL-3664] 64k does not enough (#3216)

* Unit tests: add "exists" to furi_record tests
* Unit tests: mu_warn, storage 64k test
* Storage: read/write over 64k
* Unit tests: moar tests for storage r/w for >64k cases
* Apps, libs: replace uint16_t with size_t on storage r/w operations
* Unit tests: better data pattern, subghz: warning if transmission is prohibited

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

applications/debug/unit_tests/minunit.h

@@ -81,6 +81,7 @@ __attribute__((unused)) static void (*minunit_teardown)(void) = NULL;
 
 void minunit_print_progress(void);
 void minunit_print_fail(const char* error);
+void minunit_printf_warning(const char* format, ...);
 
 /*  Definitions */
 #define MU_TEST(method_name) static void method_name(void)
@@ -150,6 +151,10 @@ void minunit_print_fail(const char* error);
                        minunit_end_proc_timer - minunit_proc_timer);)
 #define MU_EXIT_CODE minunit_fail
 
+/* Warnings */
+#define mu_warn(message) \
+    MU__SAFE_BLOCK(minunit_printf_warning("%s:%d: %s", __FILE__, __LINE__, message);)
+
 /*  Assertions */
 #define mu_check(test)                       \
     MU__SAFE_BLOCK(                          \