Allow verible.filelist per GitHub submodule

[thomas-woehrle]

A couple of questions first

• Your IDE/editor (e.g. vscode, emacs,...) you use with verible LSP: VScode
• IDE version: 1.95.2
• What other SystemVerilog plugins are active alongside: Verilog Hightlight. Source: https://github.com/tzyLee/verilog-highlight

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What activity failed
(what functionality did not work as expected (e.g. Linting, Formatting, AUTO-expansion, go-to-definition, outline, hover,...)
go-to-definition
Expectation
I have a repository with git submodules. Each submodule has its own verible.filelist file. When working in my repository, I would want to go-to-definition on the basis of the verible.filelist of the git submodule which a file is part of.
What actually happened
No go-to-definition via cmd-click is possible. Presumably because verible language server only takes into account the verible.filelist file in the root of the project, but not the verible.filelist files in the roots of the git submodules.