feat: Add FastEndpoints snippets

[pm4rcin]

This PR adds support for FastEndpoints framework based on C# minimal APIs. Here's the official webpage.

The snippets were copied directly from https://github.com/FastEndpoints/VSCode-Extension/blob/main/snippets/fe-snippets.json

[OkelleyDevelopment]

Hi @pm4rcin, thanks for the PR!

The changes reviewed look ok so far, but we will need to also update the package.json file to include something equivalent to:

{
   "language": "fastendpoints",
   "path": "./snippets/frameworks/fastendpoints.json"
}

Once that change is added then I think this PR will mostly be ready to merge. Let me know if you have any questions. 🙂

[OkelleyDevelopment]

Any update here @pm4rcin ?

[pm4rcin]

Sorry for the long delay but when you commented last time I was not sure if I want this to be merged in this state. Basically I don't like those snippets as I find attributes to be more readable but I was hesitant to change it and I'm not sure if I should duplicate snippets to have both forms or not. Maybe someone else who uses that framework could provide feedback and then we could merge it. In the meantime I'll convert to draft.