Add Pipeline API support

[ivpusic]

Implements pipeline execution and status endpoints.

New Features:

• execute_query_pipeline() - Execute query pipelines with optional performance parameter
• get_pipeline_status() - Get pipeline execution status with node details

Changes:

• Added PipelineAPI class with pipeline endpoints
• Added pipeline response models (PipelineExecutionResponse, PipelineStatusResponse, etc.)
• Implemented both sync and async versions
• Integrated into DuneClient and AsyncDuneClient

API Endpoints:

• POST /api/v1/query/{query_id}/pipeline/execute
• GET /api/v1/pipelines/executions/{pipeline_execution_id}/status

---

Note

Adds pipeline execution and status support, including models, sync/async client methods, and ExtendedAPI integration.

• Pipeline support
  • Adds PipelineAPI with get_pipeline_status() (/pipelines/executions/{pipeline_execution_id}/status).
  • Adds execute_query_pipeline() in api/execution.py and AsyncDuneClient (/query/{query_id}/pipeline/execute).
  • Integrates PipelineAPI into ExtendedAPI.
• Models
  • Introduces PipelineExecutionResponse, PipelineStatusResponse, PipelineNodeExecution, and PipelineQueryExecutionStatus.
• Async client
  • Implements async execute_query_pipeline() and get_pipeline_status().

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[bh2smith]

Looks clean to me. Might not hurt to have some test that ensures the api route is correct.