feat(aws-cloudfront, nextjs-component): support setting geo restrictions

[dphang]

Fixes: #188

Tests

Added unit tests, also tested manually.

[codecov]

Codecov Report

Merging #726 into master will increase coverage by 0.11%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #726      +/-   ##
==========================================
+ Coverage   79.58%   79.69%   +0.11%     
==========================================
  Files          55       55              
  Lines        1778     1788      +10     
  Branches      382      386       +4     
==========================================
+ Hits         1415     1425      +10     
  Misses        305      305              
  Partials       58       58              

Impacted Files	Coverage Δ
...serverless-components/aws-cloudfront/serverless.js	78.57% <ø> (ø)
...rless-components/nextjs-component/src/component.ts	90.14% <ø> (ø)
.../serverless-components/aws-cloudfront/lib/index.js	84.78% <100.00%> (+1.85%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 9296274...e96cb6a. Read the comment docs.