Inject storage into ::getInstallableConfig()

Problem/Motivation

Some provider plugins may require a storage service, rather than one passed into the plugin. An example is a plugin integrating with Config Actions. Because a config actions is applied to a storage provided by a ConfigActionsSource plugin, the storage needs to be injected into that plugin rather than passed by a config provider plugin.

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes