feat(tests): add example RDF maturity terms and configuration for provisional filtering

- Introduced a new RDF file `example_fibo_maturity.ttl` containing various maturity levels for terms, including released, provisional, and no maturity.
- Created a corresponding YAML configuration file `test_example_recipe.yml` to test the filtering of provisional terms based on the `include_provisional` setting.

Author: stephengoldbaum

metadata-ingestion/tests/integration/rdf/example_fibo_maturity.ttl

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+@prefix owl: <http://www.w3.org/2002/07/owl#> .
+@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
+@prefix fibo-fnd-utl-av: <https://www.omg.org/spec/Commons/AnnotationVocabulary/> .
+
+# Released term - should always be included
+<http://example.org/ReleasedTerm> a owl:Class ;
+    rdfs:label "Released Term" ;
+    rdfs:comment "This term has been fully approved and released" ;
+    fibo-fnd-utl-av:hasMaturityLevel fibo-fnd-utl-av:Release .
+
+# Provisional term - should be excluded when include_provisional=False
+<http://example.org/ProvisionalTerm> a owl:Class ;
+    rdfs:label "Provisional Term" ;
+    rdfs:comment "This term is still in the pipeline and not yet fully approved" ;
+    fibo-fnd-utl-av:hasMaturityLevel fibo-fnd-utl-av:Provisional .
+
+# Term without maturity level - should always be included
+<http://example.org/NoMaturityTerm> a owl:Class ;
+    rdfs:label "No Maturity Term" ;
+    rdfs:comment "This term has no maturity level specified" .
+

metadata-ingestion/tests/integration/rdf/test_example_recipe.yml

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+# Example recipe to test provisional filtering
+# Run with: datahub ingest -c test_example_recipe.yml
+
+source:
+  type: rdf
+  config:
+    source: tests/integration/rdf/example_fibo_maturity.ttl
+    format: turtle
+    dialect: fibo
+    include_provisional: false  # Change to true to include provisional terms
+    environment: PROD
+
+sink:
+  type: file
+  config:
+    filename: /tmp/rdf_test_output.json
+