[Enhancement] Mapping Provider API #135
Description
Is your enhancement related to a problem? Please describe.
Currently, MCD only supports downloading official mappings. This could be inconvenient when using other mappings.
Describe the solution you'd like
Introduce the Mapping Provider API. It can:
- Be discovered through SPI
- Provide a list of mapping versions
- Select and download mappings
Additional context
This also has an association with #82 . This enables interactive console users to conveniently choose the mappings they want.