[clang-tools-extra] [clangd] Make clangd-indexer respect .clangd configuration files (PR #214951)

[Nathan Ridge via cfe-commits]

https://github.com/HighCommander4 requested changes to this pull request.

Thanks for the update!

Looks good with a few minor remaining changes.

https://github.com/llvm/llvm-project/pull/214951