[V2] feat: supports bearer token security tag

[XiXiangFiles]

Is your feature request related to a problem? Please describe.
According to the bearer-authentication documentation, Swagger v3.x has this feature. Therefore, I think v2 needs to support it as well.

Describe the solution you'd like
I want to add this annotation for this feature.

annotation	description	parameters	example
securitydefinitions.bearerauth	Bearer Authentication auth.		// @securitydefinitions.bearerauth BearerAuth

[ubogdan]

@XiXiangFiles build is failing, I would appreciate it if you could fix that!