[Major] inspectpack3 rewrite.

[ryan-roemer]

Breaking changes

• Complete rewrite in TypeScript.
• Limit package.json:engine to >=6.0.0 (aka, the current supported Nodes).
• Use webpack stats object instead of real bundle for data input.
• The structure and substantive content of all json data structures has changed, as well as the corollary text and tsv output formats.
  • sizes
    • Remove bundle field and all min + min+gz size fields.
    • Code type field has been removed.
  • duplicates: A complete revision of the JSON format and accompanying other format outputs.
  • versions: A complete rewrite of output formats and what is actually reported on. Now, only reports versions information if there are 2+ files of the same baseName (aka, the foo.js part of lodash@1/foo.js) with the reasoning that version skews that don't result in duplicated files aren't technically a "problem".

Features

• Support for --action={sizes,duplicates,versions}
• Format options --format={json,text,tsv}
• Colorized output for --format=text
• Maintain support (with tests) for webpack versions 1-4.

/cc @kenwheeler @tptee @parkerziegler

[ryan-roemer]

Released in inspectpack@3.0.0