Support for defining attributes on a node_type

Support for defining attributes on a node_type

This commit aims to add support of attributes on node_type.
It is first of several commits to cover all support.
It includes:
 - new classes:
    AttributeDefinition
    ComponentInstanceAttribute
    IAttributeInputCommon
    IAttributeInputCommon
    AttributeDataDefinition
    MapAttributesDataDefinition
 - support of 'Import of VFC with attributes'
 - TCs fix for changed code
Next commit(s) will cover:
 - support of "Onboarding packages with attributes"
 - support of "Download TOSCA Artifacts - Tosca Model"
 - support of "Import onboarded VSP"

Change-Id: I0167abc58e8aeef3d631833cc323e466f8e71492
Signed-off-by: Vasyl Razinkov <vasyl.razinkov@est.tech>
Issue-ID: SDC-3200