[WIP] Update Python SDK using python-api-sdk

[Copilot]

• Identify endpoints in the events group from OpenAPI schema
• Create polar_sdk_python/_events.py with Events class
• Implement list() method for listing events
• Implement list_names() method for listing event names
• Implement get() method for retrieving a single event
• Implement ingest() method for batch ingesting events
• Add Events import to polar_sdk_python/_client.py
• Add events attribute to PolarClient class
• Add events initialization in PolarClient.init()
• Run linting and type checking (passed)
• Run tests (passed)

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