Feat: Support Swagger Optional Security Tag

[rojiwon123]

In OpenAPI, optional security is supported, which refers to APIs where authorization tokens may or may not be present. To support this in Nestia, some code modifications were made.

Below is how you can add optional security:

@nest.Controller("security")
export class Controller{
  /**
  * @security
  * @security bearer
  */
  async security(){}
}

about #849
about OAI/OpenAPI-Specification#14

[samchon]

Upgrade to v2.6.1, then your feature be activated.