feat: support sha512, md5, xxhash3, xxhash64, xxhash128 data integrity checksums

Integrate the new S3 checksum types in the gateway, including `SHA512`, `MD5`, `XXHASH64`, `XXHASH3`, and `XXHASH128`. This adds checksum calculation, validation, schema handling, and test coverage for the expanded checksum support.

These external packages have been used:
- `github.com/zeebo/xxh3` for `XXHASH3` and `XXHASH128`
- `github.com/cespare/xxhash/v2` for `XXHASH64`

Adjust integration tests because `aws-sdk-go-v2/service/s3` does not support automatic checksum calculation for the new checksum algorithms and returns an SDK-level error when only the checksum algorithm is provided. Only precalculated checksum values are acceptable for these checksum types.

References:
- `https://github.com/aws/aws-sdk-go-v2/issues/3404`
- `https://github.com/aws/aws-sdk-go-v2/issues/3403`

s3api/utils/chunk-reader.go

@@ -79,6 +79,11 @@ const (
 	checksumTypeSha1      checksumType = "x-amz-checksum-sha1"
 	checksumTypeSha256    checksumType = "x-amz-checksum-sha256"
 	checksumTypeCrc64nvme checksumType = "x-amz-checksum-crc64nvme"
+	checksumTypeSha512    checksumType = "x-amz-checksum-sha512"
+	checksumTypeMd5       checksumType = "x-amz-checksum-md5"
+	checksumTypeXxhash64  checksumType = "x-amz-checksum-xxhash64"
+	checksumTypeXxhash3   checksumType = "x-amz-checksum-xxhash3"
+	checksumTypeXxhash128 checksumType = "x-amz-checksum-xxhash128"
 )
 
 func (c checksumType) isValid() bool {
@@ -86,7 +91,12 @@ func (c checksumType) isValid() bool {
 		c == checksumTypeCrc32c ||
 		c == checksumTypeSha1 ||
 		c == checksumTypeSha256 ||
-		c == checksumTypeCrc64nvme
+		c == checksumTypeCrc64nvme ||
+		c == checksumTypeSha512 ||
+		c == checksumTypeMd5 ||
+		c == checksumTypeXxhash64 ||
+		c == checksumTypeXxhash3 ||
+		c == checksumTypeXxhash128
 }
 
 // Extracts and validates the checksum type from the 'X-Amz-Trailer' header