Use cddl socket in n2c api example cddl

Author: ch1bo

src/client/node-to-client/state-query/getSystemStart.cddl

@@ -1,5 +1,6 @@
-query = 1
-result = [year, dayOfYear, timeOfDayPico]
+$query /= 1
+$result /= [year, dayOfYear, timeOfDayPico]
+
 year = bigint
 dayOfYear = int
 timeOfDayPico = bigint

src/client/node-to-client/state-query/messages.cddl

@@ -18,17 +18,17 @@ acquireFailurePointNotOnChain = 1
 failure      = acquireFailurePointTooOld
              / acquireFailurePointNotOnChain
 
-query        = any
-result       = any
+$query        = any
+$result       = any
 
 msgAcquire   = [0, point]
              / [8]
              / [10]
 msgAcquired  = [1]
 msgFailure   = [2, failure]
 ; ANCHOR: api
-msgQuery     = [3, query]
-msgResult    = [4, result]
+msgQuery     = [3, $query]
+msgResult    = [4, $result]
 ; ANCHOR_END: api
 msgRelease   = [5]
 msgReAcquire = [6, point]