feat: add ChecksumType to CompleteMultipartUpload response struct

[Dansyuqri]

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Description

Add the ChecksumType field in the CompleteMultipartUploadResponse struct

Motivation and Context

Resolves #47

How to test this PR?

make test passes

Compatibility impact

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Optimization (provides speedup with no functional changes)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• All commits are signed off (git commit -s) per the DCO
• Fixes a regression (If yes, please add commit-id or PR # here)
• Unit tests added/updated
• make verifiers passes
• Relevant package tests and make build pass
• Compatibility and rollback impact documented
• Internal documentation updated
• Public documentation update opened in pgsty/silo.pgsty.com, if needed