[Feature]: Adapt containment pattern #224

What type of issue is this?

• Bug report
• Feature request

Prerequisites

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Description

For now, the containment via OwnedRelationship and OwnedRelatedElement is only duable via the AssingOwner extension method.

However, some Relationship can be owned by an Element without needing to have an OwnedRelatedElement (for exemple, FeatureType can be Owned by an Attribute but it does not need an OwnedRelatedElement.

In those case, we should be able to assign the Ownership of the FeatureType by the Attribute but the current pattern does not allow it.

Steps to Reproduce

System Configuration

• SysML2.NET version:
• Environment (Operating system, version and so on):
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