feat: Add package.json to publish to npm

[roninjin10]

Publishing to npm allows folks to add mocktimism as a dev dependency or use it with npx commands One task of https://github.com/ethereum-optimism/mocktimism/issues/11

Will require adding post install scripts similar to https://github.com/sanathkr/go-npm/blob/master/example/package.json to work

[roninjin10]

Current dependencies on/for this PR:

• 10-18-feat_Add_cli_action_config
  • PR #41
  • PR #46 👈
  • PR #42
    • PR #44
    • PR #45
    • PR #43
    • PR #39
    • PR #53
      • PR #54
      • PR #55
        • PR #56
        • PR #57

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