fix(types): filtering after rpc call

Fixes: supabase/supabase-js#1364

Author: avallete

src/PostgrestTransformBuilder.ts

@@ -1,5 +1,5 @@
 import PostgrestBuilder from './PostgrestBuilder'
-import { InvalidMethodError } from './PostgrestFilterBuilder'
+import PostgrestFilterBuilder, { InvalidMethodError } from './PostgrestFilterBuilder'
 import { GetResult } from './select-query-parser/result'
 import {
   GenericSchema,
@@ -31,7 +31,7 @@ export default class PostgrestTransformBuilder<
     NewResultOne = GetResult<Schema, Row, RelationName, Relationships, Query, ClientOptions>
   >(
     columns?: Query
-  ): PostgrestTransformBuilder<
+  ): PostgrestFilterBuilder<
     ClientOptions,
     Schema,
     Row,
@@ -60,7 +60,7 @@ export default class PostgrestTransformBuilder<
       .join('')
     this.url.searchParams.set('select', cleanedColumns)
     this.headers.append('Prefer', 'return=representation')
-    return this as unknown as PostgrestTransformBuilder<
+    return this as unknown as PostgrestFilterBuilder<
       ClientOptions,
       Schema,
       Row,