fix(lambda-at-edge): handle /_next/static image requests and minor improvements to image error logging

[dphang]

May fix: #1285

[codecov]

Codecov Report

Merging #1288 (27a33ea) into master (9af3a37) will increase coverage by 0.45%.
The diff coverage is 80.00%.

❗ Current head 27a33ea differs from pull request most recent head 0b49af8. Consider uploading reports for the commit 0b49af8 to get more accurate results

@@            Coverage Diff             @@
##           master    #1288      +/-   ##
==========================================
+ Coverage   83.35%   83.81%   +0.45%     
==========================================
  Files          97       97              
  Lines        3299     3300       +1     
  Branches      956      958       +2     
==========================================
+ Hits         2750     2766      +16     
+ Misses        484      469      -15     
  Partials       65       65              

Impacted Files	Coverage Δ
...s/libs/lambda-at-edge/src/images/imageOptimizer.ts	80.82% <80.00%> (+5.13%)	⬆️
...ages/libs/lambda-at-edge/src/images/serveStatic.ts	80.00% <0.00%> (+40.00%)	⬆️

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