reduce/move provider dependencies

[JivanAmara]

For providers to be reused effectively, their dependencies on the larger tegola project should be reduced.

For example, the import section of the gpkg provider includes:

• "github.com/terranodo/tegola"
• "github.com/terranodo/tegola/basic"
• "github.com/terranodo/tegola/geom"
• "github.com/terranodo/tegola/geom/encoding/wkb"
• "github.com/terranodo/tegola/internal/log"
• "github.com/terranodo/tegola/provider"

Where github.com/terranodo/tegola is imported only for tegola.WebMercator. The geom package is a logical place for this & would eliminate this top-level dependency.

Perform similar examination of other provider dependencies .

[ARolek]

I agree. This is part of the transition to the geom package and purging all the top level files. After the transition we should be able to remove:

• github.com/terranodo/tegola
• github.com/terranodo/tegola/basic