Standardize local-dev example and fix library bugs#203

mykola-pereyma wants to merge 10 commits intoawslabs:mainawslabs/graphrag-toolkit:mainfrom

mykola-pereyma:fix/examples-lexical-graph-local-devmykola-pereyma/graphrag-toolkit:fix/examples-lexical-graph-local-devCopy head branch name to clipboard