Port of notary query API from ENT (#6837)

node-api/src/main/kotlin/net/corda/nodeapi/notary/NotaryQueries.kt

@@ -0,0 +1,30 @@
+package net.corda.nodeapi.notary
+
+import net.corda.core.contracts.StateRef
+import net.corda.core.internal.notary.NotaryService
+import net.corda.core.serialization.CordaSerializable
+import java.time.Instant
+
+/**
+ * Implementations of queries supported by notary services
+ */
+class SpentStateQuery {
+    @CordaSerializable
+    data class Request(val stateRef: StateRef,
+                       val maxResults: Int,
+                       val successOnly: Boolean,
+                       val startTime: Instant?,
+                       val endTime: Instant?,
+                       val lastTxId: String?) : NotaryService.Query.Request
+
+    @CordaSerializable
+    data class Result(val spendEvents: List<SpendEventDetails>,
+                      val moreResults: Boolean): NotaryService.Query.Result
+
+    @CordaSerializable
+    data class SpendEventDetails(val requestTimestamp: Instant,
+                                 val transactionId: String,
+                                 val result: String,
+                                 val requestingPartyName: String?,
+                                 val workerNodeX500Name: String?)
+}