[llvm] [mlir] [MLIR] Add initial convert-memref-to-emitc pass (PR #85389)

[Marius Brehler via llvm-commits]

https://github.com/marbre approved this pull request.

One NIT for the PR description / squash commit message, *translates* must be *converts*. See https://mlir.llvm.org/getting_started/Glossary/#translation vs. https://mlir.llvm.org/getting_started/Glossary/#conversion.

https://github.com/llvm/llvm-project/pull/85389