[v2] Add api "sourceNodesStatefully" for plugins that update nodes themselves (so as to make calling sourceNodes repeatedly safe)

[KyleAMathews]

To migrate:

• gatsby-source-filesystem
• gatsby-source-sanity
• gatsby-source-datocms
• gatsby-source-contentful

If we make this migration, then we are able to call sourceNodes safely on any source plugin. When we do that, we'll also need to add garbage collecting for source plugins when we call them.

[KyleAMathews]

happened.

[KyleAMathews]

Hmm confused as this didn't happen :-(

Sep 7 me was mistaken!

[KyleAMathews]

@gatsbyjs/core we need to do this sooner than later as having gatsby-source-filesystem use sourceNodes will (is?) cause trouble with Gatsby Preview as every time we refresh nodes, a new Chokidar instance will be setup to read nodes which eventually will grow memory until it kills the process.

/cc @thebigredgeek @rase-

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[m-allanson]

Stop that, gatsbot.

[wardpeet]

@m-allanson should I add it to oss-roadmap?

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