[Maps] Allow for custom coordinate systems in Maps to better support floor maps

[holgerbrandl]

Describe a specific use case for the feature:

With Kibana Maps I'd like to implement solutions with local geo-enrichment such as factory floor maps that use relative/fixed positioning of items (tools, sensors, robots). Main use cases would be analytical, such as heatmap overlays of factory KPIs.

In case we would use actual geo-references (more tedious but possible), Kibana-Maps would not be able (afaik) to rotate the map to provide a visually aligned user experience, that is building walls should be aligned with window.

The current workaround seems to NOT use actual geo-refs but use dummy coordinates along with using custom shapes (as done in https://www.elastic.co/blog/operational-analytics-with-elasticsearch-at-elasticon-2017-part-2). This is tricky since we still need to respect lat-long constraints when preparing shapes and map zooming is not properly configurable (see #35148)

Describe the feature:

Kibana maps should allow for custom coordinate systems, such as a flat world defined by an upper left and lower right coordinate.

Maybe this is possible with WMS base layers, which have not tried yet?

[elasticmachine]

Pinging @elastic/kibana-gis

[nreese]

This feature is dependent on Elasticsearch's support for projections elastic/elasticsearch#23221

[elasticmachine]

Pinging @elastic/kibana-presentation (Team:Presentation)

[nreese]

In order to provide better transparency of priorities, issues that will not be prioritized within the next 24 months are being closed.

Tracking request in Maps ice box #154870