use-case-resources: Enable user provided metadata

* An optional argument has been added to the
  `set_up_default_resources.py` Python script to allow
  passing of a user defined use case resources metadata JSON file.
  This shortens the build time by only downloading the resources the
  end user is interested in. It also shortens the optimization part
  which takes additional minutes as it is done for all models and for
  all the specified NPU configurations.
* Adding changes to comply with Pylint
* Adding --use-case argument in `set_up_default_resources.py` to
  restrict setting up resources to the specified use cases.

Signed-off-by: Hugues Kamba-Mpiana <hugues.kambampiana@arm.com>
Change-Id: I8d38249d8a0b52e66c26e5e74c03657e29f979b0
Signed-off-by: Alex Tawse <alex.tawse@arm.com>