Original Moonshine native architecture port

Architecture reference: Hugging Face Transformers Moonshine
Copyright 2025 The HuggingFace Inc. team. All rights reserved.
Reference implementation licensed under the Apache License, Version 2.0:
https://www.apache.org/licenses/LICENSE-2.0
Pinned source: cc832f9055ba11c8c55f918ab4bda9472b910d48
https://github.com/huggingface/transformers/tree/cc832f9055ba11c8c55f918ab4bda9472b910d48/src/transformers/models/moonshine

Moonshine Tiny/Base checkpoints were released by Useful Sensors (Moonshine AI).
The publisher model cards identify the checkpoint license as MIT.
Their checkpoint licenses are separate from mlx-one's Apache-2.0 code license.
https://huggingface.co/moonshine-ai/moonshine-tiny
https://huggingface.co/moonshine-ai/moonshine-base
