Free unused buffer in chunk supplier during reset

[chenyangfb]

Description

Currently chunk supplier keep buffers in bufferPool and usedBuffers, it never free those buffer, even with reset().

This PR free unused buffer in chunk supplier during reset

Impact

Test Plan

Tested with Spark workload

After the change
Reset unused buffers, used 17 chunks (8387584 bytes), unused 65 chunks (68157440 bytes)
Reset unused buffers, used 82 chunks (76545024 bytes), unused 4 chunks (4194304 bytes)

Contributor checklist

• Please make sure your submission complies with our development, formatting, commit message, and attribution guidelines.
• PR description addresses the issue accurately and concisely. If the change is non-trivial, a GitHub Issue is referenced.
• Documented new properties (with its default value), SQL syntax, functions, or other functionality.
• If release notes are required, they follow the release notes guidelines.
• Adequate tests were added if applicable.
• CI passed.

Release Notes

Please follow release notes guidelines and fill in the release notes below.

== RELEASE NOTES ==

General Changes
* ... :pr:`12345`
* ... :pr:`12345`

Hive Connector Changes
* ... :pr:`12345`
* ... :pr:`12345`

If release note is NOT required, use:

== NO RELEASE NOTE ==