Load custom compare function 350

[bahmutov]

• closes custom compare function #350

You can pass your own NPM modules as pre-compare, compare and store functions using package.json. For example, to use both local and 3rd party NPM modules

{
  "config": {
    "snap-shot-it": {
      "pre-compare": "./pre-compare",
      "compare": "snap-shot-compare",
      "store": "./store"
    }
  }
}

Each NPM module in this case should export a definition of a function that matches the expected core function

• pre-compare is simply an identity or transformation function
• compare should match snap-shot-core#compare-function, for example see snap-shot-compare
• store is another identity or transformation function, see snap-shot-core#store-function

[bahmutov]

🎉 This PR is included in version 7.2.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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