Strip schema-only attrs from non-final version expansions - #160
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Schema-only field attributes describe the final queryable shape, so older versions cannot name them. The evolve macros now strip telemetry_schema attributes from every non-final expansion while the accumulated field state keeps them for the final version.
Also adds TypeHash for ArrayStr (sibling of the existing ArrayVec impl: hash name, capacity, and layout), needed so versioned structs can hold ArrayStr fields without literals.