feat: /v1/status include last_query_request_at.

[youngsofun]

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Summary

update when

1. post /v1/query
2. get /v1/query/<query_id>/<page_no> and found active HttpRequest

in /v1/status, return None if no query after start.

Tests

• Unit Test
• Logic Test
• Benchmark Test
• No Test - Explain why

Type of change

• Bug Fix (non-breaking change which fixes an issue)
• New Feature (non-breaking change which adds functionality)
• Breaking Change (fix or feature that could cause existing functionality not to work as expected)
• Documentation Update
• Refactoring
• Performance Improvement
• Other (please describe):

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This change is