feat: verbose file count

[d4rekanguok]

Hey @axe312ger, this PR address #22. What do you think?

• Add a verbose options that when enabled, will log out total amount of files instead
• Use Gatsby's reporter instead of console.log

plugins: [
  {
    resolve: "gatsby-plugin-netlify-cache",
    options: {
      verbose: true
    }
  }
]

info plugin-netlify-cache: Restoring 90 cached files for .cache directory with 0 already existing files.

[d4rekanguok]

Actually after testing this code, since each netlify build is completely fresh, I'm not sure we need to log out already existing files, it'll always be 0?

Instead it could be more informative to store the file count of each cache directory & compare it on post build, i.e cached extra 12 files & removed 1 file

[axe312ger]

If you additionally cache files within node_modules/.cache, it might happen that netlify already restored files for you.

Still, that post build information would be pretty useful. Happy to merge code that implements it :)

[d4rekanguok]

Ah true, I didn't think of the caches in node_modules. Will work on that post build info when I can! :)

[axe312ger]

Rebased it on master in feat/verbose and released it as canary release.

Check npm i gatsby-plugin-netlify-cache@canary and let me know :)