feature: Makes parse(source: String) public

Author: NeedleInAJayStack

Sources/GraphQL/Language/Parser.swift

@@ -2,7 +2,7 @@
  * Given a GraphQL source, parses it into a Document.
  * Throws GraphQLError if a syntax error is encountered.
  */
-func parse(
+public func parse(
     instrumentation: Instrumentation = NoOpInstrumentation,
     source: String,
     noLocation: Bool = false