Return a time value with zone-id as OffsetTime

[saig0]

Is your feature request related to a problem? Please describe.
When time value with a zone-id (e.g. time("10:31:10@Europe/Paris")) is returned then it has the type ZonedTime. This type is a special type of the FEEL engine and not part of the normal Java/Scala classes. This introduces a dependency to the engine code, forces the developers to look into the code, and may cause problems when integrating it into the application code.

Describe the solution you'd like
A time value with zone-id is returned as java.time.OffsetTime instead.
The zone-id component is ignored. The offset is created of the standard offset of the given zone-id at the current point in time.

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