Plugin framework updates (#3535)

* refactor entrypoint into helpers

* Add lookup by metadata
This is geared towards plugins packaged in pkgs that differ in name from their top module

* Make module lookup predictable in changing pkg-envs

* remove no coverage from plugin packages

* ignore coverage for production loadin

* refactor plugin collection - move assigment out

* do not cover fs errors

* test custom dir loading

* test module meta fetcher

* add a bit more safety

* do not cover sanity checkers

* add folder loading test

* ignore again for cleaner diffs for now

* ignore safety catch

* rename test

* Add test for package installs

* fix docstring name

* depreciate test for now

* Fix for out of BASE_DIR paths

* ignore catch

* remove unneeded complexity

* add testing for outside folders

* more docstrings and simpler methods

* make call simpler

* refactor import

* Add registry with all plugins

* use full registry and make simpler request

* switch path properties to methods

* Add typing to plugin

* Add a checker fnc for is_sample

* Add sample check to admin page

* Make file check a cls

* more cls methods

* Add setting for signature cheks
Fixes #3520

* make property statements simpler

* use same key in all dicts

* Use module name instead of NAME
Fixes #3534

* fix naming

* fix name

* add version checking
Fixes #3478

* fix formatting and typing

* also save reference to full array

* do not cover as we turn on all plugins

* add test for check_version

* Add version e2e test

* make test save

* refactor out assignment

* safe a db reference first

* docstring

* condense code a bit

* rename

* append logging

* rename

* also safe db reference to new object

* docstrings, refactors, typing

* fix key lookup

InvenTree/plugin/models.py

@@ -3,6 +3,7 @@
 import warnings
 
 from django.conf import settings
+from django.contrib import admin
 from django.contrib.auth.models import User
 from django.db import models
 from django.utils.translation import gettext_lazy as _
@@ -123,11 +124,11 @@ class PluginConfig(models.Model):
         self.__org_active = self.active
 
         # append settings from registry
-        self.plugin = registry.plugins.get(self.key, None)
+        plugin = registry.plugins_full.get(self.key, None)
 
         def get_plugin_meta(name):
-            if self.plugin:
-                return str(getattr(self.plugin, name, None))
+            if plugin:
+                return str(getattr(plugin, name, None))
             return None
 
         self.meta = {
@@ -136,6 +137,9 @@ class PluginConfig(models.Model):
                                                   'package_path', 'settings_url', ]
         }
 
+        # Save plugin
+        self.plugin: InvenTreePlugin = plugin
+
     def save(self, force_insert=False, force_update=False, *args, **kwargs):
         """Extend save method to reload plugins if the 'active' status changes."""
         reload = kwargs.pop('no_reload', False)  # check if no_reload flag is set
@@ -151,6 +155,20 @@ class PluginConfig(models.Model):
 
         return ret
 
+    @admin.display(boolean=True, description=_('Sample plugin'))
+    def is_sample(self) -> bool:
+        """Is this plugin a sample app?"""
+        # Loaded and active plugin
+        if isinstance(self.plugin, InvenTreePlugin):
+            return self.plugin.check_is_sample()
+
+        # If no plugin_class is available it can not be a sample
+        if not self.plugin:
+            return False
+
+        # Not loaded plugin
+        return self.plugin.check_is_sample()  # pragma: no cover
+
 
 class PluginSetting(common.models.BaseInvenTreeSetting):
     """This model represents settings for individual plugins."""