Normalize URI encodings

[felixfbecker]

This always ensures a URI like file:///node_modules/@angular is normalized to file:///node_modules/%40angular

[codecov]

Codecov Report

Merging #228 into master will increase coverage by 0.26%.
The diff coverage is 88.23%.

@@            Coverage Diff             @@
##           master     #228      +/-   ##
==========================================
+ Coverage    55.9%   56.17%   +0.26%     
==========================================
  Files          17       17              
  Lines        2041     2058      +17     
  Branches      326      330       +4     
==========================================
+ Hits         1141     1156      +15     
- Misses        775      776       +1     
- Partials      125      126       +1

Impacted Files	Coverage Δ
src/fs.ts	82.75% <100%> (ø)	⬆️
src/typescript-service.ts	75.91% <81.81%> (ø)	⬆️
src/util.ts	74.1% <89.47%> (+1.96%)	⬆️

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