community: Pass kwargs to SPARQLStore from RdfGraph

[guizsantos]

This introduces store_kwargs which behaves similarly to graph_kwargs on the RdfGraph object, which will enable users to pass headers and other arguments to the underlying SPARQLStore object. I have also made a PR in rdflib to support passing default_graph.

Example usage:

from langchain_community.graphs import RdfGraph

graph = RdfGraph(
    query_endpoint="http://localhost/sparql",
    standard="rdf",
    store_kwargs=dict(
        default_graph="http://example.com/mygraph"
    )
)

[vercel]

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