[clang-tools-extra] [clangd] [Modules] Support Reusable Modules Builder (PR #106683)

[Chuanqi Xu via cfe-commits]

ChuanqiXu9 wrote:

> thanks I think this LG in terms of module-builder interfaces, but I think we can make some more changes to implementation to ensure it's easier to maintain going forward.
> 
> speaking of maintenance, @HighCommander4 is definitely doing more of that than me recently. so i'd like to make sure he's also ok with this new complexity. i also would like to highlight @ChuanqiXu9 is definitely a responsible member of community, hence i believe he'll also be around if we have bug reports about this bits.

Thanks : )

https://github.com/llvm/llvm-project/pull/106683