feat: add centralized execution time logging

[vkryzh]

Summary

• Add centralized execution time logging to the SDK handler wrapper
• Logs total data processing time in milliseconds after every handler invocation
• Covers all app types (stream, scheduled, task, partial_rerun_merge) automatically
• No changes needed in individual apps

Changes

• Import time module
• Capture time.time() at handler entry in base_handler()
• Log elapsed time via CORVA_LOGGER.info() in a finally block

Test plan

• Verify all existing tests pass
• Deploy to a test environment and confirm "Total data processing time: X ms" appears in logs
• Verify timing is logged even when handler raises an exception

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