Simplify storing Tags in OrgNode object

- Use Set for Tags instead of dictionary with empty keys
- No Need to store First Tag separately
  - Remove properties methods associated with storing first tag separately
- Simplify extraction of tags string in org_to_jsonl
- Split notes_string creation into multiple f-string in separate line
  for code readability

src/search_type/asymmetric.py

@@ -60,7 +60,9 @@ def extract_entries(notesfile, verbose=0):
         if not "Body" in note or note["Body"].strip(empty_escape_sequences) == "":
             continue
 
-        note_string = f'{note["Title"]}\t{note["Tags"] if "Tags" in note else ""}\n{note["Body"] if "Body" in note else ""}'
+        note_string = f'{note["Title"]}' \
+                      f'\t{note["Tags"] if "Tags" in note else ""}' \
+                      f'\n{note["Body"] if "Body" in note else ""}'
         entries.append([note_string, note["Raw"]])
 
     # Close File