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Before this change constructors of `TimelineWindowDefinition` used `windowOffsetInFirstPeriodUs` for both, `positionInFirstPeriodUs` and `startTimeUs` of the exposed `Timeline.Window`. Adding `windowStartTimeUs` differentiates these two properties which allows using `FakeTimeline` for unit tests that emulate live streams with a forward moving live window in the period like `HlsMediaSource` constructs a `SinglePeriodTimeline` for live. A `TimelineWindowDefinition.Builder` is added for API usability and sanitation. PiperOrigin-RevId: 730892809