option to disable logger in browser console

[glebpigulevsky]

Is your feature request related to a problem? Please describe.
I wouldn't want to see constant logs in the browser console at all levels regarding launchDarkly's operation

Describe the solution you'd like
boolean option in the config to disable logger

Additional context
btw, link in the https://github.com/launchdarkly/js-client-sdk/blob/8675ab6b0d1a4833e4e140af3658011bf48b2162/README.md#:~:text=See%20LDOptions.logger doesnt work

[kinyoklion]

Hello @glebpigulevsky,

Logging can be disabled using the basicLogger, or by writing a custom logger. We won't be adding another configuration to disable it independently of these capabilities.

Example code disabling logging:

      const ldclient = LDClient.initialize(clientSideID, context, {
        logger: LDClient.basicLogger({ level: 'none' })
      });

Thank you for the PR to fix the links to documentation.

Thank you,
Ryan