Make OutputBuffers Thrift-compatible

[shangm2]

Description

1. We are doing thrift migration for TaskUpdateRequest
2. OutputBuffers is one of the fields in TaskUpdateRequest

Motivation and Context

1. Use thrift for TaskUpdateRequest to make the communication between coordinator and worker fast

Impact

Test Plan

1. running verifier test

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• 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.
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• Adequate tests were added if applicable.
• CI passed.

Release Notes

== NO RELEASE NOTE ==

[NikhilCollooru]

Release notes for this is not required as there is no change in behavior