InstallCapabilityProvider

Optional interface for AckpineInstallPlugins that want to expose plugin-specific install capability information via InstallerCapabilities.plugin.

After the full plugin graph has been resolved, each plugin in the graph that implements this interface will be queried via getCapabilities and its result stored, keyed by the plugin class. The result can then be retrieved by consumers via InstallerCapabilities.plugin(Plugin::class.java).