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Related to #358
This removes all usage of strings as metadata keys in Java code. This
does not yet cover off the relationship with cloud functions, which
would be the next step.
What also needs to happen following this is a larger consolidation of
key names as there are a lot of duplicates and potentially unused
values, and we can probably reduce the total key count.
PRing this now because this diff is starting to become a bit unwieldy but this represents the major portion of what is required for #358 and we can piece out the rest in other PRs.