overhaul Reflex logging

[leastbad]

Type of PR (feature, enhancement, bug fix, etc.)

Enhancement

Description

SR now logs errors to StimulusReflex.config.logger, which defaults to Rails.logger but can be set in the SR initializer.

debug info warn error fatal unknown are all supported.

This PR should be completely transparent to most developers, except that they will now see Reflex logs (at info log level) in their Rails log.

Why should this be added

The SR Logger class inexplicably used puts instead of writing to the Rails logger. This had the effect of making it so that Reflex "logs" show up in the server output even if logs are disabled, but don't show up in Rails logs even if logs are enabled. This is dumb!

Checklist

• My code follows the style guidelines of this project
• Checks (StandardRB & Prettier-Standard) are passing
• This is not a documentation update