Update element serializers for label
according to GraphBinaryV4 IO specs
#2780
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Updated serializers for
label
as a singleton list of string according to GraphBinaryV4 IO spec in Java and Python drivers.Note this branch was based off of graphbinary-add-datetime feature branch, as such the PR is to that branch to minimize file diff and facilitate review. Target branch will be changed to master-http once the feature branch is merged in #2776.