Gatsby: Extract logic for watching a directory from gatsby-page-creator so can reuse for custom page creation

[KyleAMathews]

This PR suggested adding custom validation and path manipulation to gastby-plugin-page-creator. In general we don't want to complicate plugin interfaces much. It's a better pattern to extract out logic into libraries that can be reused in multiple plugins or in a site's gatsby-node.js.

So this PR is around creating a separate library (it would be a package here in this repo) that extracts out the various bits of logic from gatsby-plugin-page-creator in a way that makes them reusable & overridable.

https://github.com/gatsbyjs/gatsby/blob/master/packages/gatsby-plugin-page-creator/src/gatsby-node.js

E.g. the library could export a few functions for:

• watching a directory
• validating paths
• creating the page object

Then someone that wants to create pages for a site but use their own custom logic could use the library to do so.

[frinyvonnick]

I would like to work on this issue 😄 I'll open a PR as soon as possible 👍

[frinyvonnick]

I named the package gatsby-page-helper. Sounds good to you @KyleAMathews 🤔?

[wardpeet]

gatsby-page-utilities maybe?

Let me drag in @gatsbyjs/ecosystem & @gatsbyjs/core into this bikeshed 😄

[KyleAMathews]

gatsby-page-utils sounds nice! :-D

Thanks for jumping on this @frinyvonnick !

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