[Maps] Support runtime fields in tooltips

[thomasneirynck]

Summary

Runtime fields will now display in tooltips.

Partially addresses #77070

To reproduce, create a runtime field. The easiest way would be just to duplicate a field.

1. load the sample logs data. This creates the kibana_sample_data_logs index and associated index_pattern
2. add a runtime field

PUT /kibana_sample_data_logs/_mappings
{
    "runtime" : {
        "foobar" : {
            "type" : "keyword",
            "script" : {
                "source" : "emit(doc['geo.dest'].value)"
            }
        }
    }
}

3. No need to refresh the kibana_sample_data_logs index pattern! this is automatic now
4. go to maps-app and add a doc-layer and add field to tooltip.

Checklist

Delete any items that are not applicable to this PR.

• Unit or functional tests were updated or added to match the most common scenarios

For maintainers

• This was checked for breaking API changes and was labeled appropriately

[elasticmachine]

Pinging @elastic/kibana-gis (Team:Geo)

[kibanamachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: d20888b

Metrics [docs]

Async chunks

Total size of all lazy-loaded chunks that will be downloaded as the user navigates the app

id	before	after	diff
maps	2.8MB	2.8MB	+325.0B

History

• 💔 Build #90770 failed 527e47d
• 💔 Build #90342 failed 7e00244

To update your PR or re-run it, just comment with:
@elasticmachine merge upstream

[nreese]

LGTM
code review and tested in chrome