Add support for x-tagGroups for Scalar Swagger Document generation

[Alex4386]

Abstract

This PR adds support for redoc's x-tagGroups (Ref), which is supported by Scalar (Reference)

Example

new Elysia()
  .use(swagger({
    path: '/docs',
    documentation: {
      tags: [
        {
           name: 'two-factor',
           description: 'Allow users to manage their 2FA config'
        }, {
           name: 'password',
           description: 'User actions for changing their own password'
        }
      ],
      'x-tagGroups': [
        {
          name: 'user',
          tags: ['two-factor', 'password']
        }
      ]
    }
  })

The example code will generate Scalar UI like the following: