Use `structlog.dev.ConsoleRenderer` when in local dev mode

[miketheman]

We configure the logging renderer here:

https://github.com/pypi/warehouse/blob/9a25f6975d3870bd8d6f9839af98b4a0c7b0e2db/warehouse/logging.py#L21

Explore using https://www.structlog.org/en/stable/console-output.html in local development mode, and if this mode increases clarity when running multiple containers and processes.