[Vis Augmenter] Optimize View Events flyout rendering

[ohltyler]

This can be improved in multiple ways. For one, decoupling from embeddables may provide inherent speed-up since the rendering can be simplified, ignoring the added overhead of embeddable logic. See existing issue #4483 for details.

Secondly, there can be big improvements in how data & events is fetched. For example, right now, each visualization is re-fetching the same source data (it is filtered out), + re-fetching the events for that particular plugin resource. Instead, this could be simplified to just fetching all source data & all events once, and passing on the particular subset of data to the individual visualizations as input. This would require decoupling from embeddables by default, since there is no way to pass data to embeddable visualizations; rather, just contextual input is passed, and data is fetched each time.