Improve error logging

[eduardomourar]

Issue #, if available: #10

Description of changes:

Fix bug where error message was not appearing in CloudWatch and improve error logging to help investigate underlying service issues.

[codecov]

Codecov Report

Merging #11 into master will increase coverage by 0.56%.
The diff coverage is 82.08%.

@@            Coverage Diff             @@
##           master      #11      +/-   ##
==========================================
+ Coverage   94.26%   94.83%   +0.56%     
==========================================
  Files          13       13              
  Lines         837      871      +34     
  Branches      124      136      +12     
==========================================
+ Hits          789      826      +37     
+ Misses         48       45       -3     

Flag	Coverage Δ
#unittests	94.83% <82.08%> (+0.56%)	⬆️

Impacted Files	Coverage Δ
src/utils.ts	83.05% <ø> (-1.33%)	⬇️
src/resource.ts	95.04% <73.33%> (-1.37%)	⬇️
src/log-delivery.ts	93.25% <82.97%> (+5.33%)	⬆️
python/rpdk/typescript/__init__.py	100.00% <100.00%> (ø)
python/rpdk/typescript/codegen.py	100.00% <100.00%> (ø)
src/callback.ts	100.00% <100.00%> (ø)

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