Add separate configuration for system data region

AS IS

Currently, Ignite users can control only two system region parameters: initialSize and maxSize. These properties are managed by DataStorageConfiguration, but same time default and user-specified regions have org.apache.ignite.configuration.DataRegionConfiguration for configuring them. It is not wise to use the same class for the system region, because there are some restrictions the codebase is relying on, but keeping to `drill new holes` in DataStorageConfiguration for the system region is not good either.

TO BE

Implement configuration class for systemDataRegion similar to org.apache.ignite.configuration.DataRegionConfiguration, but with more restricted options, ready to be added more on-demand.

Move systemRegionProperties from org.apache.ignite.configuration.DataStorageConfiguration to own class.

API changes:

1. Declare deprecated:
   • org.apache.ignite.configuration.DataStorageConfiguration#setSystemRegionInitialSize
   • org.apache.ignite.configuration.DataStorageConfiguration#getSystemRegionInitialSize
   • org.apache.ignite.configuration.DataStorageConfiguration#setSystemRegionMaxSize
   • org.apache.ignite.configuration.DataStorageConfiguration#getSystemRegionMaxSize
2. Add new methods:
   • org.apache.ignite.configuration.DataStorageConfiguration#setSystemDataRegionConfiguration(SystemDataRegionConfiguration)
   • org.apache.ignite.configuration.DataStorageConfiguration#getSystemDataRegionConfiguration
3. Add new configuration class org.apache.ignite.configuration.SystemDataRegionConfiguration