Accept time bounds for TimeRangeExpressions and TimeBucketExpressions

[mcbrewster]

We use TimeRange and TimeBucket Expression to create the presets in pivot, we need to be able to specify bounds on these types of expressions so when they get converted to just a TimeRange they don't always have the default bounds. If no bounds are passed in everything should behave as it previously did.

[lorem--ipsum]

Same, one test would be cool

[lorem--ipsum]

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