Creates a new Distribution::Path instance from the META6.json file found
at the given $prefix, and from which all paths in the metadata will be
prefixed with. :$meta-file may optionally be passed if a filename other than
META6.json needs to be used.
method meta
method meta(Distribution::Path:D:)
Returns a Hash with the representation of the metadata.
Returns an IO::Handle to the file represented by $name-path. $name-path
is a relative path as it would be found in the metadata such as lib/Foo.rakumod
or resources/foo.txt.