Part of #6408 (please read that first)

logzioexporter depends on plugin/storage/es/spanstore/dbmodel.

This is a completely silly dependency that is easy to remove. I only see it in OTEL/contrib/exporter/logzioexporter/logziospan.go

• copy whichever code is needed by logziospan.go to OTEL/contrib
• move plugin/storage/es/spanstore/dbmodel to plugin/storage/es/spanstore/internal/dbmodel