Allow using LocalStackContainer with AWS SDK v2 #1442

[musketyr]

This PR exposes the generated URI from the getEndpointConfiguration(Service) method
so it can be used by AWS SDK v2 methods.

It also exposes the default access key, secret key and region which is also required by the clients.

AWS SDK v2 users will be able to use the container without additional changes as follows:

S3Client s3 = S3Client
             .builder()
             .endpointOverride(localstack.getEndpointOverride(LocalStackContainer.Service.S3))
             .credentialsProvider(StaticCredentialsProvider.create(AwsBasicCredentials.create(
                localstack.getDefaultAccessKey(), localstack.getDefaultSecretKey()
             )))
             .region(Region.of(localstack.getDefaultRegion()))
             .build()

[bsideup]

@musketyr do you know if AWS SDK 1 and 2 can co-exist on the same classpath?
If so, could you please add a test (and maybe use it to add "Usage example with AWS SDK 2" docs section via the code include block)?

[musketyr]

@bsideup test and docs added. I've kept the copy-pasted as it was before. see ba3a73c

[bsideup]

Suggested change

	assertEquals("The created bucket has the right name", "foo", bucket.name());
	assertEquals("The created bucket has the right name", "foo", bucket.name());

duplicate

[bsideup]

1. I think test's name is a bit too specific
2. could you please reduce the test to the minimum, so that it only tests that SDK v2 works fine?

[rnorth]

LGTM - will merge. Thanks for the contribution @musketyr!