Autoimport docstring support

[bagel897]

Add docstrings to search results. This would be per-name, which causes the following issues:

1. Parsing for both import and ast needs docstring support - import should be trivial and even if ast doesn't work it'll be an improvement.
2. All the databases need a new schema with descriptions
3. The result tuple needs to be updated, which would break things that depend on tuple expansion.

The benefit however, is that we can see docstrings in autoimport results - which I think is a win.