chore: (For Discussion): Dynamic runtime detection & Joinable handle abstraction#3413

scottgerring wants to merge 6 commits intoopen-telemetry:mainopen-telemetry/opentelemetry-rust:mainfrom

scottgerring:scottgerring/runtime-v3-add-join-abstractionscottgerring/opentelemetry-rust:scottgerring/runtime-v3-add-join-abstractionCopy head branch name to clipboard