typescript(vx-hierarchy): re-write package in TypeScript

[williaster]

🚀 Enhancements

• This PR builds off of typescript(vx-group): re-write package in TypeScript #488 which added TypeScript build support, and converts the @vx/hierarchy package to TypeScript.

• Adds additional exports from d3-hierarchy which are commonly needed to generate the needed input to this suite of components (removing the need to also install d3-hierarchy as a direct dependency)

  • stratify + hierarchy to generate rootNodes for all hierarchy components
  • treeemap tile methods to be passed into Treemap.props.tile:
    • treemapSquarify, treemapBinary, treemapResquarify, treemapDice, treemapSlice, treemapSliceDice
  • the following types from @types/d3-hierarchy:
    • HierarchyNode, HierarchyRectangularNode, HierarchyCircularNode, HierarchyPointLink, HierarchyPointNode, HierarchyCircularLink, HierarchyRectangularLink, HierarchyLink

• exports a new default node component for rectangular node layouts: HierarchyDefaultRectNode

• adds a tile method select to the Treemap demo (see below)

💥 Breaking Changes

• This PR introduces React.Fragments, which requires bumping the peerDep for react to ^16.3.0-0

🐛 Bug Fix

• Fixes a bug where the default nodeComponent would render empty circle elements for Partition and Treemap because those layouts do not pass circle coordinates, they pass rectangular coordinates (x0, x1, y0, y1)

Tests

• CI
• functional /treemap, trees/, and /dendrograms demos
• generates .d.ts files

Closes #523

@hshoff @schillerk @milesj @kristw @Rudeg