docs(messaging): added Expo config section

[mwmcode]

Description

Expo config guide

Related issues

#8167

Release Summary

I recently migrated a bare RN app to Expo v52 and came across the issue mentioned above so I thought I give it a try.

Let me know if it needs to be updated slash feel free to update it.

Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
  • Yes
• My change supports the following platforms;
  • [] Android
  • [] iOS
• My change includes tests;
  • e2e tests added or updated in packages/\*\*/e2e
  • jest tests added or updated in packages/\*\*/__tests__
• I have updated TypeScript types that are affected by my change.
• This is a breaking change;
  • Yes
  • No

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[mwmcode]

Just came across #8212 (related)

[mikehardy]

Hey - 2 things - first - sorry for letting the original PR sit so long that it tempted anyone (and specifically you) into spending time on duplicate work by not closing the issue, and second - thanks very much for taking a crack at contributing either way. I do sincerely appreciate it

I went ahead and merged the other one since it was super-focused on the exact issue - this one mixed in a fair bit of core-module/app config (with the suggested changes to add the json/plist) and also added in the fetch background mode which is not messaging-specific and may not be needed for everyone, so it was a bit less focused.

That said, if our app install section for the core module doesn't show people how to add the plist or json files (does it? I'm unsure, sorry) then taking that chunk from this PR and finding a good place to pop it directly into the install page for that module could help people?

[mwmcode]

Hi @mikehardy no worries. Somehow I didn't see the first PR until after I opened this.

Regarding the fetch background mode, I just followed the iOS setup page which suggests adding it too.

As for the json files, I mentioned them to show where they go in Expo apps and how they're referenced in app.json.

👆 just clarifying the configs I suggested in the PR. I think a better approach is to have an Expo section in each page rather having them in different pages.

Cheers