Allow to specify any node as graph outputs

Partially fix aidge#161 (closed).

assigned to @olivierbichler

enabled an automatic merge when the pipeline for e6afd742 succeeds

added Enhancement ⭐ label

mentioned in issue aidge#161 (closed)

aborted the automatic merge because source branch was updated

added 1 commit

• 375a6a18 - Fixed unit test

Compare with previous version

enabled an automatic merge when the pipeline for 375a6a18 succeeds

merged

mentioned in commit 7f1ba66c