fix(tooltip): fix duplicate key warning for band area charts #327
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Summary
A band area chart has the same seriesKey for the Y0 and Y1 values. This cause the tooltip to emit a warning because of two react components with the same key. This commit fix that adding the accessor value as part of the react key.
fix #326
Checklist
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strikethroughsto remove checklist items you don't feel are applicable to this PR.[ ] Any consumer-facing exports were added tosrc/index.ts
(and stories only import from../src
except for test data & storybook)