Add per-language configuration

[gabotechs]

For JS/TS it would be useful to have a boolean flag saying if imports outside the package.json boundaries are allowed or not.

For Python, a boolean flag saying if full imports (import foo) should be taking into account for making the tree. It is common to have a python package called foo and in foo/app/logic.py do a import foo. Does that mean that foo/app/logic.py depend on the whole foo package? right now not, but maybe this should be configurable.