Snowblock API v0

[arcticicestudio]

Epic: #33

Implement the API v0 that will serve as the reference for the legacy Python (backwards compatible) implementation with the following interfaces and types:

• Ⓘ Snowblock
• Ⓣ Task
• Ⓘ TaskConfiguration
• Ⓘ TaskRegistry
• Ⓘ TaskRunner

Note that API v0 will be a legacy implementation to keep the compatibility with the original Python implementation and will be superseded with API v1 with snowsaw version 1.0.0!

[arcticicestudio]

Resolved in 988073b