sql: add hardcoded map information to Cockroach Demo for standard multi-regions

[awoods187]

For use both in #39938 and in other kinds of testing. We can set out a list of "known" locations with hardcoded lats/longs so that the webui map works.

In addition to the ones in #39938, I think we should add asia information as well.

If i user sets something like:
./cockroach demo movr --nodes 3 --demo-locality=region=us-east1,region=us-central1,region=us-west1

Then we would hard code recognize us-east1 as a specific lat/long and insert it into the MovR database to enable the webui

[jordanlewis]

I actually just filed this as #39937 - sorry 😱

[awoods187]

cool will close this

[jordanlewis]

In other words, I don't think there's any reason to make this specific to the demo - I think hardcoded system.locations for all of the known region codes is a great idea for testing and prod. Right?