Extracting out more code from the CLI for reuse elsewhere (still more
work to do, but this is a start).
This is the code for extracting npm tarballs and saving information in
the npm cache in the global deno_dir.
Fixes #26085.
Adds a basic retry utility with some defaults, starts off with a 100ms
wait, then 250ms, then 500ms
I've applied the retry in the http client, reusing an existing function,
so this also applies to retrying downloads of deno binaries in `upgrade`
and `compile`. I can make a separate function that doesn't retry so this
doesn't affect `upgrade` and `compile`, but it seemed desirable to have
retries there too, so I left it in.
Introduces a `SyncReadAsyncWriteLock` to make it harder to write to the
npm resolution without first waiting async in a queue. For the npm
resolution, reading synchronously is fine, but when updating, someone
should wait async, clone the data, then write the data at the end back.
