refactoring of metric calculations and optimization of graph preprocessing

graph_creation/cst_processing.py

graph_creation/cwl_parsing.py

graph_creation/cwl_processing.py

graph_creation/repo_processing.py

graph_creation/utils.py

metric_calculations/DependencyTraversalDFS.py

metric_calculations/FlowAnalyzer.py

metric_calculations/Neo4jTraversalDFS.py

metric_calculations/utils.py

neo4j_dependency_queries/__init__.py

neo4j_dependency_queries/create_edge_queries.py

neo4j_dependency_queries/create_node_queries.py

neo4j_dependency_queries/processing_queries.py

neo4j_dependency_queries/utils.py

neo4j_flow_queries/create_queries.py

neo4j_flow_queries/processing_queries.py

process_history/process_history.py