feat(gatsby-source-s3): Leverage Cache API

[Vacilando]

Can we better leverage Gatsby Cache API so that the pulled images persist between builds?

This is to continue the discussion from a previous incarnation of this module, see https://github.com/gatsby-uc/gatsby-source-s3/issues/16#issuecomment-1026048453

[konsalex]

Hey folks any progress on this? I can see myself cache is wiped after every gatsby develop run:

Is there any workaround on this, or it should be included in plugin's source code?

PS: I am using the source-strapi plugin

[moonmeister]

This issue is for the s3 plugin. But no progress, PRs are welcome for any plugin.