[clang-tools-extra] [clang-doc] integrate JSON generator with Mustache templates (PR #149006)

[Paul Kirth via cfe-commits]

ilovepi wrote:


Looking at the patch, I'm wondering if we can decouple the changes to output and add things like missing features in separate patches? There seems to be more changing than I expected in the template and tests. So if we can have a transition thats basically a NOP (or as close as we can get). and then fix up the template and tests after, I think that may help ease review and may make it easier to reason about changes in output.

https://github.com/llvm/llvm-project/pull/149006