[JS/TS] Allows compiling fable-library-ts for Browser environment

[goswinr]

addressing #4368
where can I add tests?

[MangelMaxime]

We probably want to add a note explaining why we are doing that

[MangelMaxime]

where can I add tests?

Hum, we don't have a setup for that.

I don't know if creating the setup required for it is worth it or not.

If I was to add the setup for that, I think we would want to create a new src/Fable.Build/FableLibrary/TypeScriptBrowser.fs that file would be based on https://github.com/fable-compiler/Fable/blob/main/src/Fable.Build/FableLibrary/JavaScript.fs.

Where we would replace PostFableBuildStage body with a code doing the

1. Apply first the copy package.json related task
2. Adapt the package.json to remove the @types/node (run npm unsintall @types/node)
3. Build the library using tsc

We would also replace the output dir to something like fable-library-js-browser.

This should cover the initial goal of trying to compile fable-library without @types/node installed. If needed, we could even configure tsconfig.json to target the browser environment but I think the current config is generic enough for that.

If you are not sure of what I am talking about, I can have a look to send a commit to this PR showcasing the change and ask you to review it.

[goswinr]

thanks @MangelMaxime you can merge if you like it. I would make a seperate PR for the test. Will also try Thoth.Json.Core with TS first..