[Task] Add samm-cli command to display a model element's definition

[atextor]

Is your task related to a problem? Please describe.
When I want to see the definition of a model element I know is present in my models root, but I don't know or remember in which namespace of file it is located, I currently can only do a text search (e.g. using grep or Windows Explorer). It would be much more convenient, if I can just have samm-cli show it.

Describe the solution you'd like
I would like a new samm-cli subcommand called "show" (or "explain", or similar), that prints a model element's definition. I want to be able to provide either a full URN or only a local name. Let's assume my current working directory is a models root, then the command should work something like this:

$ samm show temperature
@prefix samm: <urn:samm:org.eclipse.esmf.samm:meta-model:2.1.0#> .
@prefix samm-c: <urn:samm:org.eclipse.esmf.samm:characteristic:2.1.0#> .
@prefix : <urn:samm:com.example.mycompany.mydomain:1.0.0#> .
:temperature a samm:Property ;
  samm:preferredName "Temperature"@en ;
  samm:description "The current temperature"@en ;
  samm:characteristic :CelsiusTemperature .

Possible additional options:

• --fuzzy: Allows fuzzy search, e.g. also finds elements with non-identical but similar names
• --details: Display details about where the model element was resolved from (e.g. absolut file path)
• --closure: transitively include all referred elements as well, i.e. in the example also include the definition for :CelsiusTemperature

What should happen when multiple elements are found needs to be clarified. Possible options include:

• Display only the latest version (if the namespace part of the URNs are identical)
• Throw an error
• Interactive selection
• Display all of them, separated in some way