API to enable or disable plugin modules in bulk.

The api currently allows us to enable or disable only one plugin module at a time.
Using this method is slow because each call refreshes the FieldManager and the FieldScreenManager.
This can be problematic when working with a plugin that has many modules.

It would be great to have the following methods in the com.atlassian.plugin.PluginController interface:

void enablePluginModules(Collection completeKeys);
void disablePluginModules(Collection completeKeys);