[xy-chart][grid] add x/yGridValues, bump @vx/grid to fix band-scale bug

[williaster]

🏆 Enhancements
🐛 Bug Fix

This PR makes the following improvements/bug fixes for @data-ui/xy-chart

• bumps @vx/grid to ^0.0.180 so that we can leverage some new functionality and fixes
• fixes an issue with x and y gridlines where they don't work for band type scales
• adds additional customization hooks for controlling the number, position, and values of grid lines. The following are now available:
  • x/yGridOffset controls the offset of the gridline from the grid / tick value. This is useful for band scales which are offset by bandwidth() / 2. This defaults to bandwidth() / 2 if the scale is a band type, and 0 otherwise
  • x/yGridValuesallows a user to specify the exact values for grid lines. If not defined, these fall back toX/YAxis.props.tickValuesif available (so grid and ticks are in sync by default but can be independent), or undefined in which case the@vx/gridcomponents will fallback tonumTicks`.
  • (not new, but related) numTicks can be set on X/YAxis components and are used by default for the grid

Demo of custom xGridValues

cc @conglei @kristw @rmusa

[codecov]

Codecov Report

Merging #146 into master will increase coverage by 0.7%.
The diff coverage is 60%.

@@           Coverage Diff            @@
##           master    #146     +/-   ##
========================================
+ Coverage   79.79%   80.5%   +0.7%     
========================================
  Files         109     109             
  Lines        2386    2395      +9     
  Branches      547     556      +9     
========================================
+ Hits         1904    1928     +24     
+ Misses        310     290     -20     
- Partials      172     177      +5

Impacted Files	Coverage Δ
packages/xy-chart/src/utils/propShapes.js	100% <100%> (ø)	⬆️
packages/xy-chart/src/chart/XYChart.jsx	77.27% <57.14%> (+8.98%)	⬆️
packages/xy-chart/src/utils/chartUtils.js	89.58% <0%> (+2.08%)	⬆️
packages/xy-chart/src/utils/drag/util/raise.js	100% <0%> (+100%)	⬆️

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[williaster]

Merging this, want to remove the diff hit threshold in the future.