Fixes#1345
The previous implementation incorrectly parsed the `x-amz-sdk-checksum-algorithm` header for the `CompleteMultipartUpload` operation, even though this header is not expected and should be ignored. It also mistakenly treated the `x-amz-checksum-algorithm` header as an invalid value for `x-amz-checksum-x`.
The updated implementation only parses the `x-amz-sdk-checksum-algorithm` header for `PutObject` and `UploadPart` operations. Additionally, `x-amz-checksum-algorithm` and `x-amz-checksum-type` headers are now correctly ignored when parsing the precalculated checksum headers (`x-amz-checksum-x`).