[Inference Provider] Add TextCLF as an inference provider

[textclf-api]

Adding TextCLF as a new Inference Provider for the @huggingface/inference library.

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Note

Medium Risk
Touches the central provider registry and selection surface area, so misconfiguration could affect routing for provider-based inference, though the change is additive and covered by tests.

Overview
Adds TextCLF as a new Inference Provider (provider="textclf") and wires it into the provider registry so InferenceClient/async client can route conversational and text-generation requests to https://api.textclf.com/v1/chat/completions.

Introduces a new provider helper (_providers/textclf.py) with TextCLF-specific response parsing for text generation, updates provider allowlists/type unions, and extends tests to cover provider registration and URL construction.

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