Provide clangd configuration pointing to public remote index

[i-ky]

It is documented how to point clangd to LLVM public remote index server. I am wondering if it would be possible to provide .clangd configuration file pointing to LLVM public remote index server as part of llvm/llvm-project. This way "batteries are included" and potential LLVM contributors can benefit from remote index as soon as source code is checked out, no extra configuration is needed.

[i-ky]

I've tried to add such .clangd file in the root of llvm/llvm-project checkout:

Index:
  External:
    Server: clangd-index.llvm.org:5900

Remote index may not be specified by untrusted configuration. Copy this into user config to use it.

[i-ky]

clangd/clangd#908 is related.

[i-ky]

clangd/vscode-clangd#318 is also related.