Acquire semian resource for each retry in Active Record adapters

[gmcgibbon]

Previously, Active Record adapters would retry queries within the same acquisition attempt. Now, we wrap individual executions to ensure each retry is counted as one acquisition request.

[gmcgibbon]

Making retries happen at the perform_query level makes it so we need to translate exceptions early, which is a little annoying. There might be other tradeoffs too. I've put this into draft while I dig deeper.