Emit footprint in CLI

[guybedford]

This updates the CLI output to read eg:

 2620kB  dist/strong-globalize/cldr/cldr_32.0.1.json
 2620kB  dist/cldr/cldr_32.0.1.json
 6037kB  dist/index.js
16625kB  [15995ms]

instead of:

 2620kB  dist/strong-globalize/cldr/cldr_32.0.1.json
 2620kB  dist/cldr/cldr_32.0.1.json
 6037kB  dist/index.js [15995ms]

This is mainly to more easily assess #117.

[codecov-io]

Codecov Report

Merging #120 into master will decrease coverage by 0.49%.
The diff coverage is 0%.

@@            Coverage Diff            @@
##           master     #120     +/-   ##
=========================================
- Coverage   75.11%   74.61%   -0.5%     
=========================================
  Files          10       10             
  Lines         450      453      +3     
=========================================
  Hits          338      338             
- Misses        112      115      +3

Impacted Files	Coverage Δ
src/cli.js	0% <0%> (ø)	⬆️

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