Mobile (iOS/Android) implement external-links/x-callback-url

[fatflyingpigs]

Making an issue for the mobile part of #5168. To my knowledge this has not yet been implemented on any mobile platform. It seems there are a number of other bug reports that mention this, without a successful fix. https://github.com/laurent22/joplin/issues?q=is%3Aissue+x-callback & https://discourse.joplinapp.org/search?q=x-callback

Implementing this feature allows for NFC tags to be used on mobile devices with Joplin.

Environment

Joplin version: Latest (iOS 12.12.3)
Platforms: iOS 17.0.3 and iOS 15.7.1 (and Android from what I've read, but I haven't tested).

Steps to reproduce (iOS)

1. In app, copy the markdown link for the note. eg: [My Test Note](:/1586e8e9da1e495eb08c7b4cdf1a6f50)
2. Modify it to a proper external link and copy. eg: joplin://x-callback-url/openNote?id=1586e8e9da1e495eb08c7b4cdf1a6f50
3. Switch to a different note
4. [Optional] Close the app
5. Paste the external link into safari or other browser
6. Joplin launches, but not to the correct note

Describe what you expected to happen

Step 6 above should launch to the correct note.
Extra: UI entry to copy the external link, similar to the markdown link in the app. Currently desktop app has this

Logfile

No relevant entries in the logfile

Relevant

https://reactnative.dev/docs/linking?syntax=ios

[github-actions]

Hey there, it looks like there has been no activity on this issue recently. Has the issue been fixed, or does it still require the community's attention? If you require support or are requesting an enhancement or feature then please create a topic on the Joplin forum. This issue may be closed if no further activity occurs. You may comment on the issue and I will leave it open. Thank you for your contributions.

[personalizedrefrigerator]

Still an issue.

Note: This feature has also been requested on Discord and the Joplin Forum.

[github-actions]

Hey there, it looks like there has been no activity on this issue recently. Has the issue been fixed, or does it still require the community's attention? If you require support or are requesting an enhancement or feature then please create a topic on the Joplin forum. This issue may be closed if no further activity occurs. You may comment on the issue and I will leave it open. Thank you for your contributions.