[llvm] [llvm][Support] Add YAMLSchemeGen for producing YAML Schemes from YAMLTraits (PR #133284)

[via llvm-commits]

tgs-sc wrote:

Hi @jh7370!
> Realistically, this change appears to be adding too much in one go, so I'm not going to be able to meaningfully review it. > Could it be broken up into smaller pieces?
I think that I can split this patch into 2 commits: added new Derived class GenerateSchema (as this is something monolite) and unit tests for it, but it seems to me that this way you can see better how you can use the new functionality.

> Have you solicited any feedback for who would want this functionality with an RFC on the LLVM Discourse or similar?
Currently there is no such topic, but I can make it.

https://github.com/llvm/llvm-project/pull/133284