unicode-org / icu4x / 11110694623

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Remove Blob schema v1, v2, add v3 (#5608)

Fixes #5603

v3 isn't yet necessary but will become necessary with
https://github.com/unicode-org/icu4x/pull/5601. This can be landed
independently of https://github.com/unicode-org/icu4x/pull/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.


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