[BUG] Incorrect Implementation of REST Interface in POST Methods (Submodel-Repository)

[geso02]

Describe the bug

In the SubmodelRepository implementation, the methods postSubmodelElementByPathSubmodelRepo and postSubmodelElementSubmodelRepo return a ResponseEntity. However, the current implementation only returns a 201 Created status without including the created SubmodelElement in the response body.

Since the return type is already defined as SubmodelElement, the current implementation does not comply with the specified API and should be corrected to include the created object in the response body.

postSubmodelElementByPathSubmodelRepo

postSubmodelElementSubmodelRepo

To Reproduce
Steps to reproduce the behavior:

1. Post a submodel element
2. Check the return value

BaSyx (please complete the following information):

• BaSyx Version [ v2.0]
• BaSyx SDK [ Java]
• AAS Version [ DotAAS V3]

Screenshots
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Used Asset Administration files (.aasx/.json/.xml)
Please drop your AAS files here that were used when the bug was encountered.

BaSyx configuration
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System (please complete the following information):

• OS: [Linux]
• CPU architecture: x86]
• Version [master branch]