[v32] Add GaudiApp application

Andre Sailerrequested to merge
sailer/ILCDIRAC:v32_gaudiApp into Rel-v32r0

Replaces !383 (closed)

BEGINRELEASENOTES

*Interfaces
NEW: New application, GaudiApp, to run, for example, the Key4hep k4run

ENDRELEASENOTES

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