[clang-tools-extra] [clangd] Allow specifying what headers are always included via "" or <> (PR #67749)

[Nathan Ridge via cfe-commits]

HighCommander4 wrote:

> @HighCommander4 @sam-mccall do you have any capacity to review this change?

I'm happy to try and help, but I haven't really been involved in the development of the include-cleaner component, and based on the findings in my previous comment, the patch would benefit from feedback from someone more familiar with that, to provide guidance about where in the code the config option should be checked to handle the include-cleaner scenario as well.

https://github.com/llvm/llvm-project/pull/67749