feat(2690): make llm models configurable

[beelchester]

fixes: #2690
/claim #2690

Example

• Using Gemini
  Set TAILCALL_LLM_API_KEY to your Gemini API key.

  "llm": {
    "model": "gemini-1.5-flash-latest",
    "secret": "{{.env.TAILCALL_LLM_API_KEY}}"
  }

• Using Ollama
  Don't need secret.

  "llm": {
    "model": "gemma2"
  }

Models

--- Models for OpenAI
["gpt-4o", "gpt-4o-mini", "gpt-4-turbo", "gpt-4", "gpt-3.5-turbo"]

--- Models for Gemini
["gemini-1.5-pro", "gemini-1.5-flash", "gemini-1.0-pro", "gemini-1.5-flash-latest"]

--- Models for Anthropic
["claude-3-5-sonnet-20240620", "claude-3-opus-20240229", "claude-3-sonnet-20240229", "claude-3-haiku-20240307"]

--- Models for Groq
["llama-3.1-405b-reasoning", "llama-3.1-70b-versatile", "llama-3.1-8b-instant", "mixtral-8x7b-32768", "gemma-7b-it", "gemma2-9b-it", "llama3-groq-70b-8192-tool-use-preview", "llama3-groq-8b-8192-tool-use-preview", "llama3-8b-8192", "llama3-70b-8192"]

--- Models for Cohere
["command-r-plus", "command-r", "command", "command-nightly", "command-light", "command-light-nightly"]

Anything else is considered an Ollama model.
Refer to https://ollama.com/library

[codecov]

Codecov Report

Attention: Patch coverage is 51.61290% with 15 lines in your changes missing coverage. Please review.

Project coverage is 86.66%. Comparing base (648c018) to head (7e3646c).

Files	Patch %	Lines
src/cli/generator/generator.rs	0.00%	9 Missing ⚠️
src/cli/llm/infer_type_name.rs	0.00%	4 Missing ⚠️
src/cli/generator/config.rs	94.11%	1 Missing ⚠️
src/cli/llm/wizard.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2716      +/-   ##
==========================================
+ Coverage   86.31%   86.66%   +0.34%     
==========================================
  Files         256      255       -1     
  Lines       24999    25002       +3     
==========================================
+ Hits        21579    21669      +90     
+ Misses       3420     3333      -87     

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[github-actions]

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