Major Description
Create a simple conf system for classes in sql/api. This is needed for a number of classes that are moved from sql/catalyst to sql/api that require configuration access (e.g. timeZone, parsing behavior, ...).
The change will add a small common interface that allows you to read the needed configurations, this interface is implemented by SQLConf and SQLConf will be used when we are executing on the driver, and there will be an implementation using the default values for when we are in Connect mode.
