[REQUEST] Allow disabling all logging

Currently Glide does not have any option to turn off all logging, at least none I could find in GitHub and on the documentation website.

The problem with logging is it can leak sensitive information, either by a malformed URL or an other unaccounted scenario that ends up concatenating information in the request which outputs to the logs.

The issue mentions Glide's logging and documentation but names no source file, entry point, or test. Start by locating the library's logging configuration and documenting how logging is currently emitted; define and test a supported way to disable all logging, including verification that sensitive request information is not output.

Written by the indexing model from the issue text.