1.1.2: Add SD3 Pipeline (#329)

* Add SD3 Pipeline

Co-authored-by: atiorh <atiorh@users.noreply.github.com>
Co-authored-by: arda-argmax <arda-argmax@users.noreply.github.com>

* Use swift-transformers for tokenization

* Use diffusionkit converters in torch2coreml

* Documentation and cleanup

* Add model link

* Consolidate batch prediction logic

* Remove DecoderSD3.swift and consolidate logic into Decoder.swift

* Remove DiffusionKit MLX inference reference from README

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Co-authored-by: atiorh <atiorh@users.noreply.github.com>
Co-authored-by: arda-argmax <arda-argmax@users.noreply.github.com>
Co-authored-by: atila <atiorh@icloud.com>