add out-of-the-box support for external authentication with OIDC/OAuth

Hello,

I tried using the tool but there is no support for external authentication system, like OIDC.

I found there are some plugins https://github.com/apache/answer-plugins
including an OAuth 2 plugin https://github.com/apache/answer-plugins/tree/main/connector-basic

I've tried using the plugin but it doesn't work.
plugins can only be used by making a custom build of apache answer.
I've tried that but I hit successive errors, with needing firewall access to go to github, then needing go 1.22.x to run, then some error in PNPM, that needed to have exactly pnpm 1.10 to pass, then error in NPM and finally some javascript install scripts.

At this point I gave up.
I'm sorry to say but the tool is not usable without support for authentication out-of-the-box.

Could you consider including auth support in the app?

# A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]

apache answer has no support for external authentication out of the box.

## Is your enhancement request related to a problem? Please describe

apache answer has no support for external authentication out of the box.

## Describe the solution you'd like

OIDC/OAuth authentication support out of the box.

## Describe alternatives you've considered

tried the plugin, doesn't work

Comienza revisando el plugin de OAuth 2 existente en apache/answer-plugins, especialmente connector-basic, y los puntos de entrada de autenticación en Apache Answer. Determina los requisitos de integración y compilación para un flujo OIDC/OAuth listo para usar; se considera terminado cuando la autenticación externa funciona sin una compilación personalizada ni la instalación de un plugin.

Escrito por el modelo de indexación a partir del texto del issue.