[CELEBORN-1844][CIP-8] introduce tier writer proxy and simplify partition data writer #3085
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What changes were proposed in this pull request?
Most of the contents of this PR is the changes for UT, and it's derived from another PR #3083.
Why are the changes needed?
Introduce tier writer proxy and simplify the partition data writer.
Does this PR introduce any user-facing change?
NO.
How was this patch tested?
GA and manually tests.