optimization of partition folder rename operations for ctas and inser…

[chandrasekhar-kambham]

What type of PR is this?

/kind task

What does this PR do / why do we need it:

currently rename partition operations takes a long time during commit operation stage..
optimization of partition folder rename operations for ctas and insert operations.
observed 40-50% imporvement in CTAS flow
observed ~5% improvement in Insert flow

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewers:

[it-is-a-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: chandrasekhar-kambham
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[it-is-a-robot]

Welcome @chandrasekhar-kambham!

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[chandrasekhar-kambham]

/check-cla