feat(core): Accumulate tokens for `gen_ai.invoke_agent` spans from child LLM calls#17281

RulaKhaled merged 3 commits intodevelopgetsentry/sentry-javascript:developfrom

rolaabuhasna/js-662-token-attributes-on-gen_aiinvoke_agent-spangetsentry/sentry-javascript:rolaabuhasna/js-662-token-attributes-on-gen_aiinvoke_agent-spanCopy head branch name to clipboard