Replace lodash _.keys with native Object.keys

[chrisVillanueva]

Addresses: #7747

[codecov-commenter]

Codecov Report

Merging #7784 into master will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #7784   +/-   ##
=======================================
  Coverage   88.13%   88.13%           
=======================================
  Files         245      245           
  Lines        9262     9262           
=======================================
  Hits         8163     8163           
  Misses       1099     1099           

Impacted Files	Coverage Δ
...s/package/compile/events/apiGateway/lib/apiKeys.js	94.59% <100.00%> (ø)
...package/compile/events/apiGateway/lib/resources.js	97.47% <100.00%> (ø)
lib/plugins/aws/package/compile/functions/index.js	96.73% <100.00%> (ø)
...ib/plugins/aws/package/lib/generateCoreTemplate.js	95.45% <100.00%> (ø)
lib/plugins/package/lib/zipService.js	94.64% <100.00%> (ø)
lib/utils/yamlAstParser.js	97.32% <100.00%> (ø)

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[medikoo]

Thank you @chrisVillanueva !