Document all adventure SPIs

Adventure has grown quite a few SPIs that platforms should be implementing. We should have a consolidated location where these are documented. So far, these are:

• the Providers for component serializers, to customize options
• the JSONComponentSerializer providers, for different component serializer implementations
• the DataComponentValueConverter.Provider interface, for controlling conversions between different data component value types
• the ClickCallback provider, to implement callbacks
• ComponentLoggerProvider to provide appropriate serializers for component logging

Migrated from https://github.com/KyoriPowered/adventure-docs/issues/167

Start by locating the existing Adventure documentation and the five listed SPI entry points: serializer Providers, JSONComponentSerializer providers, DataComponentValueConverter.Provider, ClickCallback, and ComponentLoggerProvider. Done means a single consolidated documentation location covers each SPI and explains its platform implementation purpose.