Netflix / genie / 3190

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Standardize JSON serialization of V3 API model insant fields

Previously the JSON serialization relied on the default Jackson behavior which was to defer to `toString()` however that followed the ISO standard and would serialize to whatever fractionional
number of digits were available. On Java 8 JDKs this was ok as it would always do milliseconds. On a Java 11 JDK it would expand to 6 digits of precision which still adhers to the spec. The
problem was that within Netflix there is a widely used client with a long upgrade path that hardcoded some 3 digit precision expectation in its parsing rather than using a standard ISO8601 parsing
library for the time strings returned by the API.

This change creates a custom serializer which truncates all available Instants to millisecond precition before preceeding with the standard serialization logic of calling `toStriong()`. This should
ensure backwards compatibility as we run the server on Java 11 JDKs.

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