s3: add checksum configuration options

[analytically]

Add skip_s3_checksums to disable automatic checksum calculation and
validation for S3-compatible providers that don't support checksum
headers.

Add checksum_algorithm to specify which algorithm to use (CRC32,
CRC32C, SHA1, SHA256, CRC64NVME). Ignored when skip_s3_checksums
is enabled.

Removed UseV2Signing as it wasn't working and partially removed.

[taylorsilva]

Looks good, some tests would be nice though since the interaction between the two new params are spread out over different functions.

I would add tests:

semver-resource/driver/driver_test.go

Lines 13 to 14 in 3c5cf41

	var _ = Describe("Driver", func() {
	Context("S3", func() {

and

semver-resource/driver/s3_test.go

Line 14 in 3c5cf41

var _ = Describe("S3 Driver", func() {

I would cover the basics:

• Setting SkipS3Checksums results in the correct s3.Options being passed into the s3Client
• Setting ChecksumAlgorithm results in the S3Driver being configured correctly
• Setting ChecksumAlgorithm when SkipS3Checksums is true results in ChecksumAlgorithm being ignored and not passed into the S3Driver
• When ChecksumAlgorithm is configured in the S3Driver, calling S3Driver.Put() passes in the ChecksumAlgorithm param.

TY!

[taylorsilva]

We should check if the resulting checksumAlgorithm matches one of the types.ChecksumAlgorithm. As-is, someone can pass in anything and we'll happily pass it along.