[Temporal Types] Add support for Interpolation

[chaitan94]

Temporal Types of Sequence and SequenceSet durations can specify interpolation.

For discrete base types, only Stepwise interpolation is allowed.

For continuous base types, only interpolation can be either Stepwise or Linear.

When serialized, the text representation of these objects would start like 'Interp=Stepwise;[10@2020-01-01, ...'

• [x] Sequence
• [x] Sequence Set