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new(xychart): add (EventEmitter, Tooltip)Context + basic Tooltips (#825)

* deps(xychart): add mitt

* new(xychart): add EventEmitter context, provider, types, and hook

* new(xychart): add findNearestDatum utils

* new(xychart): add TooltipContext type, context, and provider

* new(xychart): add Tooltip, update Example

* new(xychart): add tooltip functionality to BarSeries

* fix(xychart): clean up

* fix(xychart): fix test, improve tooltip prop annotations and containerRef logic

* internal(xychart): svgCoords => svgPoint + point, svgCoord => scaledValue

* test(xychart): add Event + Tooltip tests (#835)

* test(xychart): organize test/ into subfolders that mirror src/

* test(xychart): add EventEmitterProvider + TooltipProvider tests

* test(xychart): add Tooltip test, add UseTooltipPortalOptions props

* test(xychart): add useEventEmitter tests

* test(xychart): add findNearestDatum tests

* fix(xychart): test + type fixes

1178 of 2159 branches covered (54.56%)

Branch coverage included in aggregate %.

82 of 96 new or added lines in 13 files covered. (85.42%)

1241 of 2119 relevant lines covered (58.57%)

22.21 hits per line