refactor: remove no longer needed SchemaGenerator class (#179)

lib/schema/index.js

@@ -2,23 +2,6 @@ const queryGenerator = require('./query')
 const mutationGenerator = require('./mutation')
 const { GraphQLSchema } = require('graphql')
 const { createRootResolvers, registerAliasFieldResolvers } = require('../resolvers')
-const { printSchema } = require('graphql')
-
-// REVISIT: remove class with cds^8
-class SchemaGenerator {
-  generate(services) {
-    this._schema = generateSchema4(services)
-    return this
-  }
-
-  getSchema() {
-    return this._schema
-  }
-
-  printSchema() {
-    return printSchema(this._schema)
-  }
-}
 
 function generateSchema4(services) {
   const resolvers = createRootResolvers(services)
@@ -30,4 +13,4 @@ function generateSchema4(services) {
   return schema
 }
 
-module.exports = { SchemaGenerator, generateSchema4 }
+module.exports = { generateSchema4 }