[FEATURE] add SPNEGO authentification

[scwall]

What's needed and why?

Hello, would it be possible to consider integrating SPNEGO authentication directly into the core module of Bunkerweb? You can find more information at the following link: https://github.com/stnoonan/spnego-http-auth-nginx-module. This enhancement would eliminate the need for an additional reverse proxy configuration for each server requiring a Kerberos ticket for automatic authentication. Thus, it would also simplify the use of the indispensable variable for the proper functioning of the relevant applications.

Thank you in advance.

Implementations ideas (optional)

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