Issue of running sample plugin
I try to run the sample plugin "register_actions" from the tutorial, but I don't see any new menu items in the IDE instance.
Here is the setup:
The Run configuration:

The SDK for the module

The project SDK:

The code compiled and produced a new IDEA instance, but in that instance, I did not see any new action-items in the menu.
Also, I am have question on this line of code in the .iml file
<module type="JAVA_MODULE" version="4">
Why it is a JAVA_MODULE instead of a PLUGIN_MODULE?
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It is impossible to answer without seeing your code. Create a GitHub account if you don't already have one and put your sample plugin there, so that we can see your code, plugin.xml, and settings. The line
should indeed be
<module type="PLUGIN_MODULE" version="4">In fact you can develop a plugin using a Java module as well as Plugin module.
Please firstly check if the plugin is loaded: look at Settings | Plugin and find your plugin in the list. If the plugin isn't loaded most probably it means that there is a problem with plugin.xml: check that plugin.xml is located under META-INF directory in either sources or resources root.