gh-96414: Inline code examples in sqlite3 docs (#96442)

Doc/includes/sqlite3/adapter_point_1.py

Doc/includes/sqlite3/adapter_point_2.py

Doc/includes/sqlite3/blob.py

Doc/includes/sqlite3/collation_reverse.py

Doc/includes/sqlite3/converter_point.py

Doc/includes/sqlite3/ctx_manager.py

Doc/includes/sqlite3/execute_1.py

Doc/includes/sqlite3/load_extension.py

Doc/includes/sqlite3/md5func.py

Doc/includes/sqlite3/mysumaggr.py

Doc/includes/sqlite3/row_factory.py

Doc/includes/sqlite3/shortcut_methods.py

Doc/includes/sqlite3/sumintwindow.py

Doc/includes/sqlite3/text_factory.py

Doc/library/sqlite3.rst