fix(types) - update plugins configuration interface

JSON Schema validation fails for nest-cli.json if an item in CompilerOptions.plugins[] uses the object notation.

lib/configuration/configuration.ts

@@ -20,11 +20,16 @@ interface CompilerOptions {
   tsConfigPath?: string;
   webpack?: boolean;
   webpackConfigPath?: string;
-  plugins?: string[];
+  plugins?: string[] | PluginOptions[];
   assets?: string[];
   deleteOutDir?: boolean;
 }
 
+interface PluginOptions {
+  name: string;
+  options: object;
+}
+
 interface GenerateOptions {
   spec?: boolean | Record<string, boolean>;
 }