Add statistics commands and response handling in MyMesh

- Introduced new commands for retrieving statistics: CMD_GET_STATS_CORE, CMD_GET_STATS_RADIO, and CMD_GET_STATS_PACKETS.
- Implemented corresponding response handling methods to format and send statistics data.
- Updated MyMesh constructor to initialize new member variables for managing statistics.
- Included StatsFormatHelper for formatting statistics replies.

examples/companion_radio/MyMesh.h

@@ -69,6 +69,7 @@
 
 #include <helpers/BaseChatMesh.h>
 #include <helpers/TransportKeyStore.h>
+#include <helpers/StatsFormatHelper.h>
 
 /* -------------------------------------------------------------------------------------- */
 
@@ -170,6 +171,11 @@ private:
   void checkCLIRescueCmd();
   void checkSerialInterface();
 
+  // Stats methods
+  void formatStatsReply(char *reply);
+  void formatRadioStatsReply(char *reply);
+  void formatPacketStatsReply(char *reply);
+
   // helpers, short-cuts
   void savePrefs() { _store->savePrefs(_prefs, sensors.node_lat, sensors.node_lon); }
   void saveChannels() { _store->saveChannels(this); }
@@ -178,6 +184,8 @@ private:
 private:
   DataStore* _store;
   NodePrefs _prefs;
+  mesh::PacketManager* _pkt_mgr;  // stored for stats access
+  mesh::MillisecondClock* _ms_clock;  // stored for stats access
   uint32_t pending_login;
   uint32_t pending_status;
   uint32_t pending_telemetry, pending_discovery;   // pending _TELEMETRY_REQ