fix: fix the LoRA loading issue in #265

[StarMingGao]

Motivation

To solve #265 , we give a script that can map from Lora to diffusers.

Modifications

Add the script "examples/flux.1-dev-lora-to-diffusers.py". You can modify the lora path in the script to your own lora path, and then run the script to generate the corresponding converted lora weights in your lora path directory. The converted lora weights end with 'contentverted.safesensors'.

Checklist

• Code is formatted using Pre-Commit hooks.
• Relevant unit tests are added in the tests directory following the guidance in tests/README.md.
• README and example scripts in examples are updated if necessary.
• Throughput/latency benchmarks and quality evaluations are included where applicable.
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