[harness-simulation] add support for RF enclosure simulation (#8092)

This commit adds support for RF enclosure simulation. It can pass
Leader 9.2.9, Router 9.2.9 and Router 9.2.10 in Thread Test Harness
v56.0 now.

include/openthread/cli.h

@@ -52,9 +52,9 @@ extern "C" {
 typedef struct otCliCommand
 {
     const char *mName; ///< A pointer to the command string.
-    void (*mCommand)(void *  aContext,
-                     uint8_t aArgsLength,
-                     char *  aArgs[]); ///< A function pointer to process the command.
+    otError (*mCommand)(void *  aContext,
+                        uint8_t aArgsLength,
+                        char *  aArgs[]); ///< A function pointer to process the command.
 } otCliCommand;
 
 /**

include/openthread/instance.h

@@ -53,7 +53,7 @@ extern "C" {
  * @note This number versions both OpenThread platform and user APIs.
  *
  */
-#define OPENTHREAD_API_VERSION (242)
+#define OPENTHREAD_API_VERSION (243)
 
 /**
  * @addtogroup api-instance