Cache resolved paths of dependencies

[devongovett]

This adds the resolved path of every dependency to the cache, and uses that when available so we don't need to run the resolver for subsequent builds. This speeds up cached builds on large projects tremendously. For example, on my work project, cached build times went from ~14s to ~4s.

This builds on #1304 since we don't want to store the entire package.json in the cache for every dependency. Since package.json is also listed as a dependency of each asset, when package.json changes the cache will be invalidated since the resolution of that file might also change.

[codecov-io]

Codecov Report

Merging #1309 into cleanup will increase coverage by 1.29%.
The diff coverage is 71.42%.

@@            Coverage Diff             @@
##           cleanup   #1309      +/-   ##
==========================================
+ Coverage     87.6%   88.9%   +1.29%     
==========================================
  Files           80      80              
  Lines         4567    4551      -16     
==========================================
+ Hits          4001    4046      +45     
+ Misses         566     505      -61

Impacted Files	Coverage Δ
src/Bundler.js	93.64% <71.42%> (-0.21%)	⬇️
src/assets/PugAsset.js	88.57% <0%> (-11.43%)	⬇️
src/assets/ReasonAsset.js	92.3% <0%> (-7.7%)	⬇️
src/assets/LESSAsset.js	89.79% <0%> (-4.09%)	⬇️
src/Logger.js	95.78% <0%> (-1.06%)	⬇️
src/transforms/babel.js	96.29% <0%> (+1.38%)	⬆️
src/assets/HTMLAsset.js	89.1% <0%> (+1.98%)	⬆️
src/assets/TypeScriptAsset.js	100% <0%> (+2.7%)	⬆️
src/assets/VueAsset.js	86.66% <0%> (+6.66%)	⬆️
src/visitors/dependencies.js	95.72% <0%> (+6.83%)	⬆️
... and 5 more

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