Add zstd to wasm

[easy28]

What would you like to be added

Add an option to generate zstd files for wasm head.

Why is this needed

zstd is generally faster and provides better compression ratio than br.

For which platform

WebAssembly

Anything else we need to know?

Chrome support zstd by default, expect smaller download size if zstd added.

[jeromelaban]

Thanks for the suggestion.

Note for contributors

The implementation for this provided here:

Uno.Wasm.Bootstrap/src/Uno.Wasm.Bootstrap/ShellTask.cs

Line 498 in 9b559fc

private void CompressFiles(string[] filesToCompress, string method, Action<string, string> compressHandler)

With compression handlers provided here:

Uno.Wasm.Bootstrap/src/Uno.Wasm.Bootstrap/ShellTask.cs

Line 546 in 9b559fc

private void BrotliCompress(string source, string destination)

There are likely some additional considerations to provide around the availability of a .NET implementation or wrapper for zstd, as well as server-side support for such compressed files, such as azure static apps.