Closes elastic#1211

# [35.0.0](elastic/elastic-charts@v34.2.1...v35.0.0) (2021-09-13)

### Bug Fixes

* **a11y:** restore focus after popover close with color picker ([elastic#1272](elastic/elastic-charts#1272)) ([0c6f945](elastic/elastic-charts@0c6f945)), closes [elastic#1266](elastic/elastic-charts#1266) [elastic#935](elastic/elastic-charts#935)
* **build:** fix license in package.json ([elastic#1362](elastic/elastic-charts#1362)) ([d524fdf](elastic/elastic-charts@d524fdf))
* **deps:** update dependency @elastic/eui to ^37.5.0 ([elastic#1341](elastic/elastic-charts#1341)) ([fb05c98](elastic/elastic-charts@fb05c98))
* **deps:** update dependency @elastic/eui to ^37.6.1 ([elastic#1359](elastic/elastic-charts#1359)) ([2ae90ce](elastic/elastic-charts@2ae90ce))
* **deps:** update dependency @elastic/eui to ^37.7.0 ([elastic#1373](elastic/elastic-charts#1373)) ([553b6b0](elastic/elastic-charts@553b6b0))
* **heatmap:** filter out tooltip picked shapes in x-axis area ([elastic#1351](elastic/elastic-charts#1351)) ([174047d](elastic/elastic-charts@174047d)), closes [elastic#1215](elastic/elastic-charts#1215)
* **heatmap:** remove values when brushing only over axes ([elastic#1364](elastic/elastic-charts#1364)) ([77ff8d3](elastic/elastic-charts@77ff8d3))

### Features

* **annotations:** add onClickHandler for annotations ([elastic#1293](elastic/elastic-charts#1293)) ([48198be](elastic/elastic-charts@48198be)), closes [elastic#1211](elastic/elastic-charts#1211)
* **heatmap:** add text color contrast to heatmap cells ([elastic#1342](elastic/elastic-charts#1342)) ([f9a26ef](elastic/elastic-charts@f9a26ef)), closes [elastic#1296](elastic/elastic-charts#1296)
* **heatmap:** reduce font size to fit label within cells ([elastic#1352](elastic/elastic-charts#1352)) ([16b5546](elastic/elastic-charts@16b5546))
* **xy:** mutilayer time axis step 1 ([elastic#1326](elastic/elastic-charts#1326)) ([867b1f5](elastic/elastic-charts@867b1f5))

### BREAKING CHANGES

* **xy:** - feat: removes the axis deduplication feature
- fix: `showDuplicatedTicks` causes a duplication check on the actual axis tick label (possibly yielded by `Axis.tickLabel` rather than the more general `tickFormat`)
* **heatmap:** the `config.label.fontSize` prop is replaced by `config.label.minFontSize` and `config.label.maxFontSize`. You can specify the same value for both properties to have a fixed font size. The `config.label.align` and `config.label.baseline` props are removed from the `HeatmapConfig` object.