feat(anthropic): update and align Claude model names of Vertex AI

[yamitzky]

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

  • feature (Adds support for new models) and bug fix (Corrects inaccuracies in existing Vertex AI model IDs and addresses missing model information).

• What is the current behavior? (You can also link to an open issue here)

  • The AxAIAnthropicVertexModel enum, which defines Anthropic models for Vertex AI, did not reflect the latest model lineup. Specifically, newer models such as Claude Opus 4/4.1, Claude Sonnet 4/4.5, and Claude Haiku 4.5 were missing.
  • Existing models (e.g., claude-3-7-sonnet) did not use the date-suffixed version identifiers required by Vertex AI (e.g., claude-3-7-sonnet@20250219).
  • src/ax/ai/anthropic/info.ts lacked model information (cost, context window, etc.) corresponding to the AxAIAnthropicVertexModel entries, which prevented the getModelInfo function from retrieving accurate details.
  • The latest and right model list is available at https://docs.cloud.google.com/vertex-ai/generative-ai/docs/partner-models/claude/use-claude?hl=en

• What is the new behavior (if this is a feature change)?

  • The AxAIAnthropicVertexModel enum in src/ax/ai/anthropic/types.ts has been updated to include and use the latest specified Vertex AI Anthropic model IDs (including date-suffixed versions). This allows the library to support a broader range of available models directly.
  • Corresponding model information has been added to src/ax/ai/anthropic/info.ts for each AxAIAnthropicVertexModel entry. This enables accurate cost calculation, context window management, and precise feature support determination for these models.

• Other information: