* Implement basic schema for digitalocean_sizes data source
* Implement basic read for digitalocean_sizes data source
* Implement exact match filter and sort for digitalocean_sizes data source
* Update documentation
* Gardening: Add missing sidebar_current in the /d/sizes markdown
* Change sort schema to use List type (since order should matter when applying multiple sort)
* Rework sorting sizes to be able to handle multiple sorts in defined order
Kennardy Dewanto