Add multi-group-by support for event charts

[MikeShi42]

• use multi field selector for group by in event charts (we need to follow up w/ metrics, but that requires a new selector component)
• fixed a bug where multi-group-by requires same data type properties for events.
• fixed a bug where chart edit form will do excess re-rendering due to non-memo value passed into useDebounce
• fixed a regression where if a chart is in the error state, it'll be stuck with an error message even if the chart config changes to a valid one

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Latest commit: d3eb062

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