feat(components): add modal dialog component

[phyzess]

affects: @gio-design/components, website

[azure-pipelines]

Deploy preview for ready! ✅ https://deploy-preview-137--gio-design.surge.sh

[codecov]

Codecov Report

Merging #137 into master will decrease coverage by 4.81%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #137      +/-   ##
==========================================
- Coverage   66.28%   61.46%   -4.82%     
==========================================
  Files          67       72       +5     
  Lines        1735     1871     +136     
  Branches      453      488      +35     
==========================================
  Hits         1150     1150              
- Misses        582      717     +135     
- Partials        3        4       +1     

Impacted Files	Coverage Δ
...ackages/components/src/components/modal/Footer.tsx	0.00% <0.00%> (ø)
packages/components/src/components/modal/Modal.tsx	0.00% <0.00%> (ø)
...es/components/src/components/modal/ModalContext.ts	0.00% <0.00%> (ø)
...ages/components/src/components/modal/StepModal.tsx	0.00% <0.00%> (ø)
packages/components/src/components/modal/Title.tsx	0.00% <0.00%> (ø)

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[azure-pipelines]

Deploy preview for ready! ✅ https://deploy-preview-137--gio-design.surge.sh

[azure-pipelines]

Deploy preview for ready! ✅ https://deploy-preview-137--gio-design.surge.sh