[clang] [clang][utils] Remove ClangDataFormat.py for now (PR #96385)

[Vlad Serebrennikov via cfe-commits]

Endilll wrote:

LGTM

> We should eventually develop proper formatters for Clang data-types, but these are currently not ready.

Yes, I'm still working on that in background. LLDB has to have a way to understand custom RTTI we use in AST nodes for statements and types, because adding a vtable pointer will increase memory pressure. I'm working on such mechanism, and that's why it's taking so long.

https://github.com/llvm/llvm-project/pull/96385