Add support for converting `RMSNorm` when using `transformer-engine`

[cyanic-selkie]

Description & Motivation

Recently, models (e.g., Qwen3/Llama) have replaced the LayerNorm layers with the RMSNorm layers because they perform identically but are slightly more efficient.

To support it, a new branch almost identical to the LayerNorm would have to be added to the conversion function.