feat(lambda-at-edge): start copying locale-specific page/data files t…

[dphang]

…o output assets

• First part of: Next.js 10 localization in pathname #721, to copy all locale-specifi page/data files to the assets output directory.
• Second part is to add the routes for these pages in manifest
• Need to add some unit tests

[codecov]

Codecov Report

Merging #883 (14ad854) into master (3db3238) will decrease coverage by 0.03%.
The diff coverage is 73.68%.

@@            Coverage Diff             @@
##           master     #883      +/-   ##
==========================================
- Coverage   80.42%   80.38%   -0.04%     
==========================================
  Files          63       63              
  Lines        2258     2279      +21     
  Branches      514      518       +4     
==========================================
+ Hits         1816     1832      +16     
- Misses        380      385       +5     
  Partials       62       62              

Impacted Files	Coverage Δ
packages/libs/lambda-at-edge/src/build.ts	90.68% <73.68%> (-1.18%)	⬇️

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[karthikcodes6]

When can we start to use this feature?