[Runtime] Include partial errors in oneOf/anyOf decoding errors #66
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Motivation
The runtime changes to address apple/swift-openapi-generator#275.
This makes debugging of decoding of oneOf/anyOf much easier, as the individual errors aren't dropped on the floor anymore.
Modifications
Added SPI that allows the generated code to collect and report partial errors when a oneOf/anyOf fails to decode (that includes trying multiple subschemas, which themselves emit errors when they're not the right match).
Result
Easier debugging of oneOf/anyOf decoding issues.
Test Plan
Tested manually as part of the generator changes, we don't generally test exact error strings.