[APM] Show framework icon for the span type DB and Messaging aligning it with service map and backends UI.

[formgeist]

Summary

As proposed alignment of the span naming in elastic/apm#446 the span row design could be updated to show the framework icon.

We have a function describing which icon to use for the appropriate framework. We have a fallback for DB (missing for Messages).

Solution

Elasticsearch example

When hovering the icon, we should display a tooltip with the type and subtype values described.

[elasticmachine]

Pinging @elastic/apm-ui (Team:apm)

[botelastic]

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