feat(read-tree): Pass in-tree location to imported package sets

Passes the location from the root at which packages are imported on to
all packages.

The path is passed in as a parameter called 'locatedAt' which contains
a list of strings with each individual path component.

For example, the blog source in `services/tazblog` will have a list
with `[ "services" "tazblog" ]` passed in as the `locatedAt`
attribute.

This can be used for enabling features such as path-specific imports
when using things like buildGo.

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