Add set_log_verbosity function about quicli HOT 4 OPEN

Could the levels be enums and not integers? There was also discussion about using RUST_LOG in #46. How would that fit in?

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I think LoggerBuilder::from_env should be called at the start, such that an environment variable can be used for overrides. I mean, that's the reason to use env_logger, isn't it? But that seems orthogonal.

If we're designing an easy wrapper around "the logging implementation", we shouldn't be afraid to use log's terminology to talk about it. Therefore I think the following signature feels best currently (subject to bikeshed of course):

fn set_up_logger(
    default: ::log::LevelFilter,
    overrides: &[(&str, ::log::LevelFilter)],
) -> Result<()>

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I think LoggerBuilder::from_env should be called at the start

👍

If we're designing an easy wrapper around "the logging implementation"

FTR, originally, the function was about turning "number of -v flags given" into a LogLevel.

I'm still unsure of what kind of API to expose (cf. #51 (comment))

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