Output index in lsif format

[matteeyah]

I have checked that this feature is not already implemented

• [X] This feature does not exist

Use case

Lots of tools online use the lsif file format to provide "smart" features related to a codebase. One of them is navigating around the codebase by clicking on class names in SCM tools (like GitLab). This project generates an index internally, used for navigating though the codebase, but it's not dumped to a file, and it doesn't use the lsif format.

Description

The index that ruby-lsp generates is dumped into a lsif file that I can use with other tools.

Implementation

No response