Csparql2 integration into SMOL

[emrekenar]

RSP4J csparql2 engine is integrated into SMOL.

New keywords:

• streamer: Specifies if a class is streamer.
• emits: Declares which attributes are streamed by the streamer class, after the execution of a method.
• clock: Specifies if the variable is determines the timestamp in RDF streams. (Only one non-decreasing int allowed)

New statements:

• monitor: Takes a C-SPARQL2 (RSP-QL) query and registers it to the engine. Returns a Monitor object.
• window: Takes a Monitor object and reads its results. Returns a List object.
• pushStatic: Takes a string with comma-separated list of sources (heap, staticTable etc.). Pushes the current SMOL knowledge graph into C-SPARQL engine as a static named graph. Returns the reference IRI.

[Edkamb]

Thanks for the pull request! We will review it in the next time