Support downloading compressed objects from 'remote'

[code-ape]

What would you like to be added: My team is creating a cache of all pre-built nexe objects (os + node versions) and uploaded them all as compressed objects (using gzip). But when we went to use them, we discovered nexe doesn't appear to support compressed object download for remote URL.

Why is this needed: It adds a bit of efficiency and flexibility to storing downloadable assets.

Proposed change (technical level): Nexe first checks for the file ending in .gz then the uncompressed one. If the compressed on is found, it is downloaded and decompressed.

[torusrxxx]

[mrexodia]

Looks good, thanks!

[calebboyd]

I'm currently reworking the asset caching and api surface for that - https://github.com/nexe/nexe/discussions/851#discussioncomment-439618 If you have feedback can you add it there for continuity?

[code-ape]

I'm currently reworking the asset caching and api surface for that - #851 (comment) If you have feedback can you add it there for continuity?

@calebboyd: Done 🎉