add set log level function

[elegantm]

/kind feature
log level output

set log level must be useful when debug a online program

Describe the solution you'd like
[A clear and concise description of what you want to happen.]

zap:

https://pkg.go.dev/go.uber.org/zap#example-AtomicLevel-Config
cfg.Level.SetLevel(zap.ErrorLevel)

logrus

https://github.com/sirupsen/logrus
log.SetLevel(log.WarnLevel)

Anything else you would like to add:
[Miscellaneous information that will assist in solving the issue.]
without set level ,i use flag package to set log level. like below
`

               //logger *logr.Logger
                _ = flag.Set("v", "0")

		fmt.Println("set debug log level 0 ", logger.GetSink().Enabled(3))

		flag.Parsed()

		logger.V(2).Info("debug v2")`

[pohly]

Is this perhaps a duplicate of #336?

[elegantm]

Is this perhaps a duplicate of #336?

yeah, the same feature issue

[pohly]

/close

Duplicate of #336.

[k8s-ci-robot]

@pohly: Closing this issue.

In response to this:

/close

Duplicate of #336.

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