Creates a new, empty S3JSON struct, setting it as `empty`.

NewFromBytes takes a []byte representation of a JSON document and constructs a S3JSON document from it.

Inserts _key.

NewS3 creates a new S3 object for the bucket given.

S3 holds a bucket structure (containing VCAP_SERVICES information) and an S3 client connection from the min.io libraries.

S3JSON structs are JSON documents stored in S3.