Add `creationDate` to AssetAdministrationShellDescriptor AND `createdAfter` Query parameter to /shell-descriptors && /lookup/shells

[tunacicek]

What is missing?

A new parameter creationDate is needed in the AssetAdministrationShellDescriptor(optional for SubmodelDescriptors) to enable search capabilities. This parameter is essential for filtering and querying based on creationdate.
See Concept-filtering-shells.

Additionally, a new optional query parameter createdAfter should be added to the APIs

• /shell-descriptors and
• /lookup/shells

to filter shells. The createdAfter parameter will allow to retrieve only AssetAdministrationShellDescriptor entries with a creationDate after the provided createdAfter timestamp.

The metamodel related to this parameter is described in detail in the issue: Metamodel for creationDate/createdAfter.

How should it be fixed?

Following changes needed:

1. Add a new parameter creationDate to the AssetAdministrationShellDescriptor (optional for SubmodelDescriptors) based on the metamodel
2. Introduce a new optional query parameter createdAfter in the APIs /shell-descriptors and /lookup/shells

• I have signed the required Developer Certificate of Origin (DCO) already.

[BirgitBoss]

Similar requirement in #144

[sebbader-sap]

We need to have a look at this after the 3.1 release.