refactor: Use global http client to share the connection pool

[Xuanwo]

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Summary

Utilize a global request client to share the connection pool. This change can prevent users from creating too many short-lived connections, which could exhaust the entire local port range in extreme cases.

NOTE: this is the default behavior of aws-sdk-sdk and we have already uses the same http client in our DataOperator. This change makes sure that all stage, external location table can use the same client.

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 

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Docker Image for PR

• tag: pr-16276-edba3cb-1724062731

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ClickBench Report

• hits: https://benchmark.databend.com/clickbench/pr/16276/10451049095/hits.html
• internal: https://benchmark.databend.com/clickbench/pr/16276/10451049095/internal.html
• load: https://benchmark.databend.com/clickbench/pr/16276/10451049095/load.html
• tpch: https://benchmark.databend.com/clickbench/pr/16276/10451049095/tpch.html