Add web export support for C#

[Muggyfox1]

Describe the project you are working on

small C# projects I want to easily share with others.

Describe the problem or limitation you are having in your project

Web export for C# is not supported

Describe the feature / enhancement and how it helps to overcome the problem or limitation

support export to web for C# projects.

Quick chart comparison for end user, no web export vs web export

This will

1. Allow easier sharing for C# games
   a. if it's a mono issue, this also opens the door to any other language that can compile done to mono
2. Makes game jams easier to join when using C#
3. this is a feature that GDscript has over C#, This would make it more welcoming to people who know C#, want to make web games and not learn GDscript.

Describe how your proposal will work, with code, pseudo-code, mock-ups, and/or diagrams

Export a project for web as normal, regardless of being GDscript or C#.
The experience should be seamless between the two (optimally, it should be seamless regardless of language).

If this enhancement will not be used often, can it be worked around with a few lines of script?

I am not currently aware of a work around.

Is there a reason why this should be core and not an add-on in the asset library?

Web is a large platform that should be able to run out of the box.

This is a major downside for developers when looking at using the engine w/ mono, if added in from the start, that downside is fixed.

Web games are the easiest way to play a game as an end user.
Many developers have C# knowledge, but will be cut off from publishing to web platforms because of this missing feature unless they want to learn GDScript to do it.

blockers

this issue seems to be the main blocker upstream.
dotnet/runtime#75257

To my understanding, Godot runs C++ and then launches the C# code from C++. This isn't possible yet in WASM.

[Spartan322]

This is a dotnet sourced problem, not an engine problem, there's nothing that can be done until Microsoft resolves it with dotnet.