Grid Widget

[agubler]

Type: feature

The following has been addressed in the PR:

• There is a related issue
• All code matches the style guide
• Unit or Functional tests are included in the PR

Description:

Ports le-grid to dojo widgets.

Needs a11y and styling review after merging to ensure they are inline with expectations for a dojo widget.

Resolves: #570

[codecov]

Codecov Report

Merging #569 into master will decrease coverage by 0.98%.
The diff coverage is 91.88%.

@@            Coverage Diff             @@
##           master     #569      +/-   ##
==========================================
- Coverage   99.61%   98.63%   -0.99%     
==========================================
  Files          32       42      +10     
  Lines        2615     2997     +382     
  Branches      749      806      +57     
==========================================
+ Hits         2605     2956     +351     
- Misses         10       41      +31

Impacted Files	Coverage Δ
src/grid/index.ts	100% <100%> (ø)
src/grid/widgets/Footer.ts	100% <100%> (ø)
src/grid/utils.ts	100% <100%> (ø)
src/grid/widgets/PlaceholderRow.ts	100% <100%> (ø)
src/grid/widgets/Cell.ts	100% <100%> (ø)
src/grid/widgets/Header.ts	75% <75%> (ø)
src/grid/widgets/Grid.ts	81.35% <81.35%> (ø)
src/grid/widgets/Row.ts	88.88% <88.88%> (ø)
src/grid/processes.ts	93.42% <93.42%> (ø)
src/grid/widgets/Body.ts	95.49% <95.49%> (ø)
... and 10 more

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