fix(lambda-at-edge): await external API rewrite

[dphang]

No description provided.

[codecov]

Codecov Report

Merging #1232 (2b91d62) into master (787197b) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1232   +/-   ##
=======================================
  Coverage   83.07%   83.07%           
=======================================
  Files          96       96           
  Lines        3226     3226           
  Branches      942      942           
=======================================
  Hits         2680     2680           
  Misses        481      481           
  Partials       65       65           

Impacted Files	Coverage Δ
packages/libs/lambda-at-edge/src/api-handler.ts	100.00% <100.00%> (ø)

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