Clean logs and create a custom Logger

[KevinnZou]

@DatL4g I cleaned unused logs and created a custom logger. For testing, we can set the minSeverity to Debug and then change it to Info before publishing to prevent users from seeing test logs.

[DatL4g]

Looks good for now.

Please add a method to the WebViewState where we can specifiy the severity and/or a custom logger. (Whatever you like more)
This way the user can decide the logging process and we don't have to switch the type for release, instead we can just specifiy the debug severity in the basic example methods

[KevinnZou]

Looks good for now.

Please add a method to the WebViewState where we can specifiy the severity and/or a custom logger. (Whatever you like more) This way the user can decide the logging process and we don't have to switch the type for release, instead we can just specifiy the debug severity in the basic example methods

@DatL4g Thanks for your suggestions! I added the method in WebSetting which I think is more suitable than WebViewState. Please let me know if any further changes are needed.