[FR]: Add openrouter/qwen/qwen3-235b-a22b-2507 to model_prices_and_context_window.json

[ralsofias]

Proposal summary

I need qwen/qwen3-235b-a22b-2507 model with Cerebras provider added to model_prices_and_context_window.json. URL.

Motivation

I need this combination in particular to be able to track accurate cost.

[Nimrod007]

will be tackled with #4504

[YarivHashaiComet]

Jira Ticket Created: OPIK-3723

[collincunn]

closed by #3680