feat(log): Allow a log formatter per target

[BinaryMuse]

This PR adds a format method to Target, allowing each target to have a different formatter. It also adds reset_format to the Builder to remove the default formatter.

Motivation

When using the with_colors method with both a console-based and a file-based log target, the control codes for the colors are included in the log file. A custom formatter can be used when using TargetKind::Dispatch, but then you lose out on the automatic file rotation that the plugin provides.

Allowing a formatter per target solves this issue with techniques like the following:

Builder::new()
    .reset_format()
    .targets([
        Target::new(TargetKind::Stderr)
        .format(
            move |out, message, record| {
                // custom colorized output here
            },
        ),
        Target::new(TargetKind::LogDir { file_name: None })
        .format(move |out, message, record| {
            // custom non-colorized output here
        }),
    ])
    .build(),

[github-actions]

Package Changes Through 7d4338f

There are 4 changes which include log with minor, log-js with minor, updater with minor, updater-js with minor

Planned Package Versions

The following package releases are the planned based on the context of changes in this pull request.

package	current	next
api-example	2.0.38	2.0.39
api-example-js	2.0.34	2.0.35
log	2.7.1	2.8.0
log-js	2.7.1	2.8.0
updater	2.9.0	2.10.0
updater-js	2.9.0	2.10.0

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[FabianLars]

thanks again