change(loongsuite-instrumentation-langchain): improve token usage extraction & context propagation#148

Cirilla-zmh merged 2 commits intoalibaba:mainalibaba/loongsuite-python-agent:mainfrom

Cirilla-zmh:fix/capture_tokensCirilla-zmh/loongsuite-python-agent:fix/capture_tokensCopy head branch name to clipboard