Add spreadsheet factory functionality to copy_absolutes.py

Imported Enum to define a CLI parameter with a predefined set of values to choose from. Created a spreadsheets_dir option and factory option.

geomagio/processing/copy_absolutes.py

@@ -71,7 +71,15 @@ def copy_absolutes(
         starttime=UTCDateTime(starttime),
         endtime=UTCDateTime(endtime),
     )
+
+    # confirm whether or not to copy absolutes
     print(f"Found {len(readings)} absolutes")
+    copy = typer.confirm(f"Are you sure you want to copy {len(readings)} absolutes?")
+    if not copy:
+        print("Not copying absolutes")
+        raise typer.Abort()
+    print("Copying over absolutes")
+
     # write readings to metadata service
     metadata_factory = MetadataFactory(token=metadata_token, url=metadata_url)
     with typer.progressbar(