Add Prettier with tslint plugin and precommit hook

[agubler]

Type: feature

The following has been addressed in the PR:

• There is a related issue
• All code matches the style guide
• Unit or Functional tests are included in the PR

Description:

Adds support for Prettier to for code style rules and formatting. Include precommit hook that runs prettier on all .ts files and an npm script that runs prettier against the codebase.

Related to dojo/meta#206

[codecov]

Codecov Report

Merging #20 into master will increase coverage by <.01%.
The diff coverage is 97.18%.

@@            Coverage Diff             @@
##           master      #20      +/-   ##
==========================================
+ Coverage   98.28%   98.29%   +<.01%     
==========================================
  Files          14       14              
  Lines         292      293       +1     
  Branches       73       78       +5     
==========================================
+ Hits          287      288       +1     
  Misses          1        1              
  Partials        4        4

Impacted Files	Coverage Δ
src/i18n-plugin/I18nPlugin.ts	100% <100%> (ø)	⬆️
src/css-module-dts-loader/loader.ts	100% <100%> (ø)	⬆️
src/static-build-loader/loader.ts	100% <100%> (ø)	⬆️
src/css-module-plugin/CssModulePlugin.ts	100% <100%> (ø)	⬆️
src/css-module-decorator-loader/loader.ts	100% <100%> (ø)	⬆️
...8n-plugin/dependencies/InjectedModuleDependency.ts	100% <100%> (ø)	⬆️
src/i18n-plugin/templates/setLocaleData.ts	100% <100%> (ø)	⬆️
src/external-loader-plugin/ExternalLoaderPlugin.ts	100% <100%> (ø)	⬆️
src/static-build-loader/getFeatures.ts	100% <100%> (ø)	⬆️
src/promise-loader/index.ts	70.58% <50%> (ø)	⬆️

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