feat: Creation of test files for migration of annotations (#1182)

Closes #1181.

### Summary of Changes

- Add two versions of an api, its api data and (migrated) annotation
data
- Improve detection of instance attributes


### Testing Instructions

run the parse-package commands for the apis and the annotations and
verify that the json files are correct generated or use the script in
`migration_test_data`

---------

Co-authored-by: Aclrian <Aclrian@users.noreply.github.com>

Author: Aclrian

data/annotations/sklearn__annotations.json

@@ -17218,6 +17218,7 @@
         }
     },
     "enumAnnotations": {},
+    "expertAnnotations": {},
     "groupAnnotations": {},
     "moveAnnotations": {
         "sklearn/sklearn.ensemble._forest/RandomForestClassifier": {