invoice: Implement new plugin property USAGE_TRANSITIONS for usage plugins. #2082
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The intent is to be able to communicate subscription transitions to a (usage) plugin to provide more flexibility and possibly have the plugin aggregate usage points in a way that will be compatible with what Kill Bill usage module expects. The new property is
USAGE_TRANSITIONS.In 7cea0bd, this is purely refactoring to be able to extract the computation of transitions from usage module from the usage item generation.
In [27570ae], this is the implementation to pass the new plugin property to usage plugins.
Tests: I verified the new property appears and is available from a usage plugin.