Add static setters to KernelExtension.

[nojaf]

In our corporate environment, we cannot access the public internet and would need to use our own CDN endpoint.

Similar to #145 allows us to set this.

[nojaf]

Hi @zyzhu and @cartermp,

Any chance this could make it in?
We are still using XPlot for some projects and can't easily upgrade.

[cartermp]

ahhh FFS out of date .NET versions and fake

[nojaf]

@cartermp I replace FAKE with Fun.Build in #181 to avoid the build problem.

[nojaf]

@cartermp the build is green now.

[nojaf]

Thanks @cartermp ! Any chance we could get a release with this?

[cartermp]

I was hoping to get in #179 (comment) first, let me see about this by end of day?

[jonsequitur]

There's an approach to custom formatters for .NET Interactive that's a bit simpler and doesn't require a reference to the .NET Interactive libraries, if that's interesting.

https://github.com/dotnet/interactive/blob/main/docs/formatting.md#typeformattersourceattribute

[nojaf]

Any updates on this @cartermp?

[cartermp]

Done and done

[nojaf]

Thank you!