feat: add mariadb persistence options

[plusiv]

Adding Mariadb persistence options default values is a cool idea since Helm users can easily control how much storage they can dedicate for MariaDB Primary and Secondary Pods, as well as their custom storage classes and size, also the ability to disable PVCs for testing purposes adds more usability to the project.

The values were taken from the official documentation.

[dlen]

You are on a roll! Thanks again for contributing! Yeah we could add this section definitely!

[dlen]

Thanks for your contribution again!!