Remove Blob schema v1, v2, add v3 #5608
Merged
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Fixes #5603
v3 isn't yet necessary but will become necessary with #5601. This can be landed independently of #5601 but these PRs will bitrot each other. Slight preference to landing this first.
(At the moment, V2 == V3, but #5601 breaks the format)
This makes V1 and V2 data still detectable by ICU4X, but they will throw a helpful error when attempting to load them.
From a user's POV, there is now only the "blob" format (which covers both V003 and V003Bigger, picked at datagen time based on data size.