fix(lambda-at-edge): use 307 redirect for root -> locale URI instead …

[dphang]

…of rewrite

Related: #721

[codecov]

Codecov Report

Merging #886 (d2f998d) into master (828b9dd) will decrease coverage by 0.00%.
The diff coverage is 92.00%.

@@            Coverage Diff             @@
##           master     #886      +/-   ##
==========================================
- Coverage   80.37%   80.36%   -0.01%     
==========================================
  Files          64       64              
  Lines        2390     2394       +4     
  Branches      547      550       +3     
==========================================
+ Hits         1921     1924       +3     
- Misses        406      407       +1     
  Partials       63       63              

Impacted Files	Coverage Δ
...ages/libs/lambda-at-edge/src/headers/addHeaders.ts	100.00% <ø> (ø)
...ckages/libs/lambda-at-edge/src/routing/rewriter.ts	100.00% <ø> (+1.96%)	⬆️
...ages/libs/lambda-at-edge/src/routing/redirector.ts	81.25% <87.50%> (+3.12%)	⬆️
...ackages/libs/lambda-at-edge/src/default-handler.ts	91.75% <100.00%> (-0.03%)	⬇️
...es/libs/lambda-at-edge/src/routing/locale-utils.ts	100.00% <100.00%> (ø)

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