767 fix error reporting

[atextor]

Description

• Overhaul of the error reporting: Models are not merged into one RDF graph any more, but instead a view to their union (via an RDF dataset) is created. This keeps the parser token information in TokenRegistry up to date (as long as a model was not migrated in the meantime).
• The above point also adresses the detection and reporting of duplicate model element definitions.
• The RustLikeViolationFormatter is removed, it was never intended to have a separate formatter for that, but instead the functionality was incorporated into the regular ViolationFormatter (thus breaking change).
• ViolationFormatter now uses a consistent formatting for Syntax Errors vs. Semantic Errors
• Parsing and reporting of wrong literal values was improved (e.g., samm:exampleValue "123"^^xsd:int when Characteristic uses xsd:string datatype).
• samm-cli was changed in a way to also apply the ViolationFormatter for loading errors (e.g., when a samm:Property is missing its samm:characteristic), thus highlighting the source location where this occurs.
• In the AspectModelLoader, the new wrapper method "withValidation()" is added that allows to perform all loading functionality with integrated validation and that returns an Either of violations or the loaded Aspect model

Fixes #767. Fixes #772.

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works

[Yauhenikapl]

LGTM!

[github-actions]

Release v2.11.0 addresses this.