[Feature Request]: Version detection of LoRA networks should check SAI ModelSpec keys

[Nerogar]

Is there an existing issue for this?

• I have searched the existing issues and checked the recent builds/commits

What would your feature do ?

The version of LoRA networks is detected by network.detect_version() (in extensions-builtin/Lora/network.py). This function only checks for the keys ss_base_model_version and ss_v2. It would be great if this function could also check for modelspec.architecture key defined in https://github.com/Stability-AI/ModelSpec. Right now LoRAs that follow the SAI standard are not detected with the correct version.

Proposed workflow

If the keys ss_base_model_version and ss_v2 are not found, the function should check the modelspec.architecture key defined in https://github.com/Stability-AI/ModelSpec.

Additional information

No response