Featherless integration

[DarokCx]

Description

Added Featherless Integration as a model provider

[Please provide a detailed description of your contribution, including the main changes and their purpose]

Additional Notes

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Screenshots

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• I agree to contribute all code submitted in this PR to the open-source community edition licensed under GPLv3 and the proprietary official edition without compensation.
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• I confirm that this code is my original work, or I have obtained the appropriate authorization from the copyright holder to submit this code under these terms.
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