feat: add Fabric Regular Synthesizer to Streamlit app

[aquemy]

Add Fabric Regular Synthesizer to Streamlit app:

When Fabric Regular Synthesizer is selected, the input SDK Token is displayed and validated on the fly. If there is no token or the token is invalid, the following error and guidance is displayed:

When a particular path is specified for a model, we check in real time if it is a local model or from the SDK. If it is from the SDK, we display the token field and automatically fill it with the value serialized during training:

As the token might become invalid in between, we allow the user to change it. If the token is present with the model file but invalid, we display it as well:

[fabclmnt]

@aquemy approved 🚀 ! Nevertheless, I have a few small requests:

• Rename the model to ydata-sdk Synthesizer. Depending on the data type selected before, it will be the Regular of the Time-Series that will be available.

• Can we please add the details on ydata-sdk to the Streamlit app About.py file under the current architectures that are supported so the users can access the docs and understand the new model origin.