Add a hugo module version query JSON cache

[bep]

This relates to #14416 when using e.g. version = "<v3.0.0" in your module import. This is very useful, but since Go needs to recalculate the correct version on every Hugo build, it's slow.

Go has a API to take in a cached JSON response, so this should be relatively simple to implement.And well worth it.

I suspect that people would want to control the expiry of this, so I suggest we make it its own cache, so I suggest:

• A new file cache named modulequeries with:
  • dir = ':cacheDir/modulequeries'
  • maxAge = '24h'

This means that in downloadModuleVersion:

• Create a key using path + version
• Check file cache, if it exists, pass the filename as -reuse argument to download.
• Store the returned JSON in the file cache.