add firestore new exports

Author: 菊池健吾

src/firestore/firestore-namespace.ts

@@ -57,6 +57,14 @@ export namespace firestore {
   export import WhereFilterOp = _firestore.WhereFilterOp;
   export import WriteBatch = _firestore.WriteBatch;
   export import WriteResult = _firestore.WriteResult;
+  export import PartialWithFieldValue = _firestore.PartialWithFieldValue;
+  export import WithFieldValue = _firestore.WithFieldValue;
+  export import Primitive = _firestore.Primitive;
+  export import NestedUpdateFields = _firestore.NestedUpdateFields;
+  export import ChildUpdateFields = _firestore.ChildUpdateFields;
+  export import AddPrefixToKeys = _firestore.AddPrefixToKeys;
+  export import UnionToIntersection = _firestore.UnionToIntersection;
+  export import ReadOnlyTransactionOptions = _firestore.ReadOnlyTransactionOptions;
 
   export import setLogFunction = _firestore.setLogFunction;
 }