util: move deprecated utils to runtime deprecation
The deprecation code has been created in 6.12.0, I think we can move to runtime deprecation in 22 Moving the following APIs from documentation-only deprecation to runtime deprecation:
- util._extend
- util.isArray
- util.isBoolean
- util.isBuffer
- util.isDate
- util.isError
- util.isFunction
- util.isNull
- util.isNullOrUndefined
- util.isNumber
- util.isObject
- util.isPrimitive
- util.isRegExp
- util.isString
- util.isSymbol
- util.isUndefined
- util.log