Code Nav PoC: API for fetching code-nav info

Igor Drozdovrequested to merge
id-fetch-lsif-ranges into master

What does this MR do?

We're experimenting with the ability to add our own code navigation features. The idea is to store LSIF dump provide an API endpoint and fetching the code-navigation info for a particular file.

This MR provides API for fetching code navigation info from the stored LSIF sqlite-dump (sqlite is used for the first iteration because https://github.com/microsoft/lsif-node/tree/master/sqlite already exists). Related issues:

Edited by Igor Drozdov

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