Add mouse events to line slices

[sigmike]

On the Line chart the mouse events (onMouseEnter, onMouseMove, onMouseLeave and onClick) work fine when the mesh is enabled but not when the slices are enabled. This PR fixes that.

Related issue: #1401.

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[azhard4int]

@plouc Can we get this merged, we need mouse event feature for line slices at Usermaven.com

[Stormtv]

This would be very helpful

[Stormtv]

@plouc & @wyze any chance to get this merged?

[yo-johnnyd-hc]

Oh yes please! I need this as well.

[nepstein10]

Adding on to say this change would be amazing to have merged in!

[zikowang]

Nice work! We need this feature as well.

[fspin]

I think this is also related: #2187
It will be great indeed if one of these PR can be merged! 🙏

[un-neil]

@plouc & @wyze please can we get this merged?

[WhyBeeKay]

Bump
Can we get this merged please? @plouc

[plouc]

LGTM, however I think this should be added to the docs, but this can be done in a separate PR, as adding doc is currently undocumented 😅.

[cbix]

@sigmike @plouc I noticed this passes the slice to the handler while normally they'd receive a point, was this on purpose? It's particularly confusing with TypeScript. While I'm aware the line chart still lacks full TS support I see two possible improvements here:

1. change the event handler so it optionally receives a slice or a point, something like

export type PointMouseHandler = (point: Point, slice: null, event: React.MouseEvent) => void
export type SliceMouseHandler = (point: null, slice: Slice, event: React.MouseEvent) => void
export interface LineProps {
  // ...
  onMouseEnter?: PointMouseHandler | SliceMouseHandler
  // ...
}

2. add extra event handlers for slices (onSliceMouseEnter etc.)

[damianr13]

Is there any fix in version v.0.80.0? I am unable to upgrade due to the following issue: #2310