Further tidyups + refactoring for new structure

* Add implementation tests for orchestrator + logging tests
* Standardise method/class vars for extractors to see if they are suitable
* Fix bugs with removing default loguru logger (allows further customisation)
* Fix bug loading required fields from file
*

tests/data/test_modules/example_module/example_module.py

@@ -0,0 +1,28 @@
+from auto_archiver.core import Extractor, Enricher, Feeder, Database, Storage, Formatter, Metadata
+
+class ExampleModule(Extractor, Enricher, Feeder, Database, Storage, Formatter):
+    def download(self, item):
+        print("download")
+
+    def __iter__(self):
+        yield Metadata().set_url("https://example.com")
+
+    
+    def done(self, result):
+        print("done")
+
+    def enrich(self, to_enrich):
+        print("enrich")
+
+    def get_cdn_url(self, media):
+        return "nice_url"
+    
+    def save(self, item):
+        print("save")
+    
+    def uploadf(self, file, key, **kwargs):
+        print("uploadf")
+
+    
+    def format(self, item):
+        print("format")