This is the introductory work to support the new requirements for unfurling
URLs (while the message is a draft) and displaying link previews (after the
message is sent). Refer to the related status-go PR for a lot more interesting
details https://github.com/status-im/status-go/pull/3471.
Fixes https://github.com/status-im/status-mobile/issues/15469
### Notes
- The old link preview code will be removed separately, both in status-go and
status-mobile.
- I did the bulk of the work in status-go
https://github.com/status-im/status-go/pull/3471. If you want to understand
how this is all implemented, do check out the status-go PR because I heavily
documented the solution, rationale, next steps, etc.
### Performance
Does the feature perform well? Yes, there's very little overhead because
unfurling URLs happen in status-go and the event is debounced. I also payed
special attention to use a simple caching mechanism to avoid doing unnecessary
RPC requests to status-go if the URLs are cached in the client.
I have some ideas on how to improve performance further, but not in this PR
which is already screaming for reviews.
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