GH-485 Add Lucene Threshold and update to rdf4j 5.1.0

[ate47]

Issue resolved (if any): #485

Description of this pull request:

Update rdf4j to 5.1.0

add the 2 new document options to the compiler:

• mdlc:luceneMaxDocs : Same value as LuceneSail#MAX_DOCUMENTS_KEY
• mdlc:luceneNumResults : Same value as LuceneSail#DEFAULT_NUM_DOCS_KEY

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