added filter nfinset

Author: ronak2ram

app/code/Magento/GraphQl/etc/schema.graphqls

@@ -10,6 +10,7 @@ type Mutation {
 input FilterTypeInput @doc(description: "FilterTypeInput specifies which action will be performed in a query ") {
     eq: String @doc(description: "Equals")
     finset: [String] @doc(description: "Find in set. The value can contain a set of comma-separated values")
+    nfinset: [String] @doc(description: "Not find in set. The value can contain a set of comma-separated values")
     from: String @doc(description: "From. Must be used with 'to'")
     gt: String @doc(description: "Greater than")
     gteq: String @doc(description: "Greater than or equal to")