Currently `f8E4M3` is mapped to `Float8E4M3FNType`. This PR renames `f8E4M3` to `f8E4M3FN` to accurately reflect the actual type. This PR is needed to avoid names conflict in upcoming PR which will add IEEE 754 `Float8E4M3Type`. https://github.com/llvm/llvm-project/pull/97118 Add f8E4M3 IEEE 754 type Maksim, can you review this PR? @makslevental ?