[voq][chassis]Add show fabric counters port/queue commands (#2522)

What I did
Enable show fabric counters port command:

show fabric counters port

  ASIC    PORT    STATE    IN_CELL    IN_OCTET    OUT_CELL    OUT_OCTET    CRC    FEC_CORRECTABLE    FEC_UNCORRECTABLE    SYMBOL_ERR
------  ------  -------  ---------  ----------  ----------  -----------  -----  -----------------  -------------------  ------------
     0       0       up          0           0           4          740      0                  3               305128             3
     0       1       up          0           0           4          740      0                314               232123           245
     0       2       up          0           0           4          740      0                  0               265156             0
.......
Enable show fabric counters queue command :

  ASIC    PORT    STATE    QUEUE_ID    CURRENT_BYTE    CURRENT_LEVEL    WATERMARK_LEVEL
------  ------  -------  ----------  --------------  ---------------  -----------------
     0       0       up           0             N/A              N/A                N/A
     0       1       up           0             N/A              N/A                N/A
 ......

Author: jfeng-arista

orchagent/main.cpp

@@ -708,9 +708,8 @@ int main(int argc, char **argv)
         if (gMySwitchType == "voq")
         {
             orchDaemon->setFabricEnabled(true);
-            // SAI doesn't fully support counters for non fabric asics
-            orchDaemon->setFabricPortStatEnabled(false);
-            orchDaemon->setFabricQueueStatEnabled(false);
+            orchDaemon->setFabricPortStatEnabled(true);
+            orchDaemon->setFabricQueueStatEnabled(true);
         }
     }
     else