Move info- back to the front of .conda for limited range request web servers

[dholth]

Checklist

• I added a descriptive title
• I searched open requests and couldn't find a duplicate

What is the idea?

Move info- to the front of the .conda archive in case a web server does not support range requests.

It was moved to the back for streaming create or transmute, but "knowing the full size before starting zstandard compression to limit RAM usage on decompression" turned out to be more important than avoiding temporary files on compression.

Why is this needed?

No response

What should happen?

No response

Additional Context

Python's zipfile always needs to see the end of the .conda for the directory, however there are specialized streaming zip libraries that can do an okay job reading item headers without the central directory.