feat(util-dynamodb): enable undefined values removal in marshall

[trivikr]

Issue #, if available:
Fixes: #1816

Description of changes:
Enables removal of undefined values in marshall by setting removeUndefinedValues=true

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[codecov-io]

Codecov Report

Merging #1840 (6f79f56) into master (f2a47e8) will increase coverage by 0.01%.
The diff coverage is 95.65%.

@@            Coverage Diff             @@
##           master    #1840      +/-   ##
==========================================
+ Coverage   79.30%   79.32%   +0.01%     
==========================================
  Files         368      368              
  Lines       15132    15147      +15     
  Branches     3222     3231       +9     
==========================================
+ Hits        12001    12015      +14     
- Misses       3131     3132       +1     

Impacted Files	Coverage Δ
packages/util-dynamodb/src/marshall.ts	100.00% <ø> (ø)
packages/util-waiter/src/waiter.ts	100.00% <ø> (ø)
...middleware-user-agent/src/user-agent-middleware.ts	93.10% <66.66%> (ø)
packages/util-dynamodb/src/convertToAttr.ts	98.70% <100.00%> (-1.30%)	⬇️
packages/util-waiter/src/createWaiter.ts	100.00% <100.00%> (+11.76%)	⬆️
packages/util-waiter/src/poller.ts	100.00% <100.00%> (ø)
packages/util-waiter/src/utils/validate.ts	100.00% <100.00%> (ø)
protocol_tests/aws-json/endpoints.ts	81.48% <100.00%> (ø)
lib/storage/src/data-chunk/readable-helper.ts	88.23% <0.00%> (-4.08%)	⬇️
... and 11 more

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