Feat/dynamic model

[ishaksebsib]

Description

Added runtime model selection support (DynamicModel) to all providers

// dynamic model with default setting
let dyn_model = OpenAI::model_name("gpt-5");

// dynamic model with custom setting
let dyn_from_build = OpenAI::<DynamicModel>::builder()
        .model_name("gpt-5")
        .api_key("sk-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx")
        .base_url("https://api.openai.com/v1")
        .build()
        .unwrap();

Related Issue

#67

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist

• I have read the Contributing Guidelines.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• My changes generate no new warnings.
• I have added tests that prove my fix is effective or that my feature works.
• New and existing unit tests pass locally with my changes.
• Any dependent changes have been merged and published in downstream modules.

[greptile-apps]

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[gaki2]

I appreciate your help :) @ishaksebsib