map/geographic browse of NewspaperTitle objects

[ebenenglish]

This is a placeholder ticket, more detail TK

We want to provide a map-based view of the place of publication data for NewspaperTitle objects, so users can:

• easily get a sense of the geographic coverage of newspapers in the repository
• easily find newspapers in their area of interest

As a non-admin user
When I am on the [browse-titles-by-map] page
I should see a map
And the map should indicate the place of publication location for every NewspaperTitle in the repository
And when I interact with the location (hover? click?)
I should see a list of titles from that location
And I should be able to click on the title
And when I click on the title
I should see the NewspaperTitle#show view for that title

Existing examples of this often use counties or states as bounds for the map interface. However, since we are creating a generalized view, and have no idea what the geopgraphic scope of the downstream implementation may be, we need to keep this as generic as possible. Displaying locations as points on a base map layer is probably the best way to go.

Examples:

• https://newspapers.library.wales/
• more TK

The map should be rendered in a partial so it can (reasonably) easily be displayed on any page, but we will need to create a new page/view for this, maybe at /newspapers_map or something along those lines.

blacklight-maps has some utility for this type if functionality, but this project hasn't been updated in some time, and may not be compatible with current Hyrax/Blacklight.