Feature: more JS types

[hildjj]

Support more types that are available in both the browser and Node:

• Blob
• File
• URLPattern (node 24)
• URLSearchParams

Figure out pattern for supporting types that exist in the user's runtime environment, but not everywhere.

[hildjj]

I see a few possible paths:

• tag 27
• Register new tag that is like tag 26 but for JS. Something like: [module: string|undefined, constuctorName: string, ...args: unknown[]] that defaults to using globalThis if module is not specified.
• Register a new tag for each.

[hildjj]

Although I really like the second approach, it might not work for us. It would necessitate an async call to import() during decode.

[hildjj]

One issue is that Blob (at least) requires an async call to get its contents, even if streaming.