Add timeout parameter to BulkImport.perform() method

[Copilot]

This PR adds a timeout parameter to the BulkImport.perform() method to allow users to set a timeout for bulk import operations, similar to the existing BulkImport.commit() method.

Changes

• Added timeout=None parameter to BulkImport.perform() method signature
• Updated the method to pass the timeout parameter to job.wait() when wait=True
• Added documentation for the new timeout parameter
• Added test coverage for the timeout functionality

Usage

import tdclient

client = tdclient.Client()
bulk_import = client.create_bulk_import("my_import", "my_database", "my_table")

# Without timeout (existing behavior)
bulk_import.perform(wait=True)

# With timeout (new functionality)
bulk_import.perform(wait=True, timeout=300)  # 5 minute timeout

Backward Compatibility

This change is fully backward compatible. All existing code will continue to work exactly as before, with the timeout defaulting to None (no timeout) when not specified.

The implementation leverages the existing timeout functionality in the Job.wait() method, ensuring consistent behavior across the codebase.

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[tung-vu-td]

LGTM