Utility to create an in-memory storage configuration for testing. Storage options can be obtained
via the #getOptions() method. Returned options will point to FakeStorageRpc.
Note, the created in-memory storage configuration supports limited set of operations and is
not thread-safe:
Supported operations
object create
object get
object delete
list the contents of a bucket
Unsupported operations
bucket create
bucket get
bucket delete
list all buckets
generations
file attributes
patch
continueRewrite
createBatch
checksums, etags
IAM operations
FakeStorageRpc#list(String, java.util.Map) lists all the objects that have been created
rather than the objects in the provided bucket. Since this class does not support creating,
listing and deleting buckets, the parameter bucket here is not actually used and on serves as a
placeholder.
