[analysis-scripts] add type hints, remove unused variables, minor fixes

share/analysis-scripts/build.py

share/analysis-scripts/build_callgraph.py

share/analysis-scripts/estimate_difficulty.py

share/analysis-scripts/external_tool.py

share/analysis-scripts/list_files.py

share/analysis-scripts/make_wrapper.py

share/analysis-scripts/normalize_jcdb.py

share/analysis-scripts/source_filter.py