[Task] CLI - relax fixed models directory structure

[BirgitBoss]

Is your task related to a problem? Please describe.
In
https://eclipse-esmf.github.io/esmf-developer-guide/tooling-guide/samm-cli.html#models-directory-structure a strict folder structure is required to be able to resolve shared namespaces or splitted namespaces

In the future I would like to add SAMM models as part of a Submodel Template, e.g. here
https://github.com/admin-shell-io/submodel-templates/tree/main/published/Control%20Component%20Instance/1/0 in a subfolder "semantics" or similar

The thinking is similar to https://github.com/eclipse-tractusx/sldt-semantic-models/tree/main/io.catenax.battery.battery_pass/3.0.1/gen, (in gen .aasx files are generated) only the other way around

Describe the solution you'd like
Similar to the system variable "PATH" it should be possible to define where to look for (shared) aspect models.

Or you may add a configuration file (similar to a registry with logical IDs and mapping to endpoints)

<namespace> <path>, <namespace#aspect> <path>

where to look for and this configuration file could be an additional parameter is the CLI call

[chris-volk]

(See also somewhat related issue #474 )