[csharp] Add a server generator for FastEndpoints

[elendil-software]

This pull request add a new generator for FastEndpoints.

It allows to generate an ASP.NET server project that use FastEnpoints.

Options allows to enable some FastEndpoints functionalities like :

• RFC7807 & RFC9457 Compatible Problem Details
• Security
• Request DTO Validation
• Response Caching
• API Versioning

Related issue : #19649

Technical committee mentions @mandrean @shibayan @Blackclaws @lucamazzanti @iBicha