add: telephone game example (#712)

* add: telephone game example

* add: transcribe to smoketest SDKs
update: switch to v2 clap
fix: final log message extra newline

* refactor: polly command to only use async where appropriate
refactor: telephone command for readability
update: use tracing instead of log
add: missing description to Cargo.toml
fix: undo gitignore change
fix: undo addition of transcribe to smoketest

* add: missing changelog entry

* refactor: simplify use of async with tokio::main