make untestable parts testable non-interactively

[chainsawriot]

auth_setup's state of being completely untested scares me.

[chainsawriot]

https://github.com/schochastics/rtoot/blob/6cb54be861889de817ba3dae56102b4c70a56f3a/R/auth.R#L32-L42

Spin off this non-interactive part and test this part.

[chainsawriot]

• auth_setup - 60% done
  • check_token_rtoot
• process_query's rate limit
  • wait_until
  • rate_limit_remaining

[chainsawriot]

• This logic

https://github.com/schochastics/rtoot/blob/5821642244d09dbb755bd6557eed7cdccb15be4f/R/utils.R#L100-L109