fix: global plugins in app.config.mongoose.client

[JayJay1024]

Checklist

• [x] npm test passes
• [x] tests and/or benchmarks are included
• [x] documentation is changed or added
• [x] commit message follows commit guidelines

Affected core subsystem(s)

Description of change

// {app_root}/config/config.default.js
exports.mongoose = {
  url: 'mongodb://127.0.0.1/example',
  options: {},
  // mongoose global plugins, expected a function or an array of function and options
  plugins: [createdPlugin, [updatedPlugin, pluginOptions]],
};

VS

// recommended
exports.mongoose = {
  client: {
    url: 'mongodb://127.0.0.1/example',
    options: {},
    // mongoose global plugins, expected a function or an array of function and options
    plugins: [createdPlugin, [updatedPlugin, pluginOptions]],
  },
};

[atian25]

need unittest

[JayJay1024]

unittest

这个测试就只能是把config.default.js改了