feat: create simplified path-based config locations

[mmalenic]

The regex configuration can be complex to use, so there should be an alternative that is simple to use and works for most cases with reasonable defaults.

To do this, a path-based location can be created.

For example, to configure a local resolver, the directory and prefix can be specified using the file scheme:

"file://data/prefix

This would mean that requests to /reads/prefix/<id> would be accepted by this resolver, and look for files in the local directory at data.

Similar concepts can be made for S3 and URL storage:

"s3://bucket/prefix"
"https://example.com/prefix"