Configurable search providers from config

[zoran995]

What this PR does

Fixes #5141 Requires https://github.com/TerriaJS/TerriaMap/pull/515

After investigation as the best option appears to utilize the existing model system for SearchProviders.

• wrote proposal as architecture decision record
• added SearchProviderMixin to connect searchProviders with a model system
• ported existing search providers to the proposed model
• added defaults to BingMapsSearchProviders and AustralianGazetteer for testing purposes.

Testing

Default SearchProviders are BingMaps and AustralianGazetteer, need to apply registerSearchProviders and comment out reference to BingMapsSearchProviderViewModel.

Pending

• [x] Make everything support i18next code and load correct names in GUI
• [x] Tests
• [x] Documentation
• [x] Create TerriaMap PR

Future work

• Introduce server-side WFS SearchProvider which will perform a search using terriajs-server and return the results.

Checklist

• [x] There are unit tests to verify my changes are correct or unit tests aren't applicable (if so, write quick reason why unit tests don't exist)
• [ ] I've updated CHANGES.md with what I changed.

[zoran995]

This is ready for review, if anyone has time to check. p.s. Sorry, it turned out to be a monster PR.

[zoran995]

Hi @steve9164, just to check is this still interesting for Terria team to rebase the changes when I am free?

[zoran995]

Hi @nf-s I have synced the code with the latest main and it is ready for review. p.s. Would you like me to completely rebase and squash the code in a single commit to avoid polluting history with 2+ years old commits?

[nf-s]

Hi @zoran995 Thanks so much! A rebase would be great. We don't think squash is required - but whatever you prefer!

We will try to review it in the next few weeks.

Thanks again 🙂