Store CGMES OperationalLimit class rdf:ID

[m-karo]

Describe the current behavior

At current implementation there is no way to get OperationalLimit rdf:ID from network model.

Describe the expected behavior

Methods get_operational_limits() and/or get_current_limits() returns mrid/rdf:ID of OperationalLimit class when argument all_attributes=True is passed. Same as get_operational_limits() currently return "group_name" which is OperationalLimitSet class mrid/rdf:ID.

Describe the motivation

Allows to generate NC SAR profile which needs to reference to OperationalLimit from Terminal. Use case is NC SAR profile generation after security analysis.

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