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LSIF: multi-lang/project support

Administrator requested to merge lsif-multi-project into master

Created by: chrismwendt

This adds support for multi-lang/project repositories by introducing the concept of a root associated with each LSIF dump.

  • The root is the path prefix into the repository at which the LSIF dump is mounted.
  • The empty string is a valid root.
  • If you upload a new LSIF dump for the same repo@commit, any existing LSIF dump with a root that is a prefix of the new LSIF dump's root (or vice versa) gets deleted. This retains the ability for users to reupload and overwrite dumps for the same commit.
  • Nearest-commit lookup takes into account the root and only returns dumps that contain the given file path.

Implements a simplified form of RFC 24: LSIF for multi-project repositories: https://docs.google.com/document/d/1ocoxE_Jnee70_RjQEFSz58jxRE3VZuNg9OGHvu68O6o/edit#heading=h.7i5nt52rbb8l

Linking to prerequisite PR: ID-based filenames https://github.com/sourcegraph/sourcegraph/pull/5963

TODO

  • Translate to/from paths within the LSIF dump by prepending/stripping the root to/from file paths
  • Add test

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