tarantool / go-storage / 25091281424

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fix: rewrite VersionEqual/NotEqual against 0 to count predicate

TCS errors when a mod_revision predicate references a key that does not
exist, so etcd's canonical absence/presence idioms VersionEqual(key, 0)
and VersionNotEqual(key, 0) failed against TCS. The encoder now detects
this shape and emits the TCS-native count target on the wire (== 0 / != 0),
mirroring the rewrite TCS's server-side etcd shim performs for MOD == 0
and MOD != 0. The Predicate value is unchanged; only wire bytes differ.
Other version comparisons and non-zero values are not rewritten.

Closes #61

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