refactor: move edc runtime metamodel here

[paullatzelsperger]

What this PR changes/adds

Moves all the metamodel classes and annotation, such as @Provides, @Inject etc. and the contents of tooling/module-domain of the EDC repo out of there and into this repository.

Why it does that

Many of the metamodel annotations and classes are used by EDC and by a (yet-to-implement) autodoc plugin, thus there must be a standalone artifact providing these classes.

Further notes

• in the EDC repo there will be a corresponding PR, in which the code is removed and the import statements are updated. However, this should be merged first, and a release must be pushed to MavenCentral.

Linked Issue(s)

Contributes to eclipse-edc/Connector#1988

Checklist

• added appropriate tests?
• performed checkstyle check locally?
• added/updated copyright headers?
• documented public classes/methods?
• added/updated relevant documentation?
• assigned appropriate label? (exclude from changelog with label no-changelog)
• formatted title correctly? (take a look at the CONTRIBUTING and styleguide for details)

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