Define openedge db system

[thompson-tomo]

Area(s)

area:db

What's missing?

The openedge db system defined in semconv

Describe the solution you'd like

A db system is defined for openedge as used in https://github.com/open-telemetry/opentelemetry-dotnet-contrib/blob/main/src/OpenTelemetry.Instrumentation.EntityFrameworkCore/Implementation/EntityFrameworkDiagnosticListener.cs