Well-defined encoding of test input data #127
Description
As PartiQL evolves to have a containerized Ion type (a'la variant('ion')) we must define the canonical encoding of PartiQL values which the conformance test may/may not use.
Currently we a partiql value encoding in Ion using the de-facto standard, but we must be careful to not treat this as back-ticked Ion (aka variant).
The partiql-lang-kotlin test runner depends on a "PartiQL Value Reader" which understands the "PartiQL Encoded as Ion" representation.
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