The following changes should be implemented in dags/hivemind_etl_helpers/src/db/github/transform.
### Tasks
- [x] Create a class `GithubSummaryTransformer`
- [x] Inherit from [SummaryTransformer](https://github.com/TogetherCrew/airflow-dags/blob/feat/hivemind-summary-transformer-abstract/dags/hivemind_etl_helpers/src/utils/summary/summary_transformer.py). See [example](https://github.com/TogetherCrew/airflow-dags/blob/feat/hivemind-summary-transformer-abstract/dags/hivemind_etl_helpers/src/db/discord/summary/summary_utils.py).
- [x] Create a public method `transform` that transforms the summary to a llama-index document and add the required metadata. See [details](https://www.notion.so/rndadocs/Github-Vectorize-Summary-fe006094d382427eb1daf746a9055849?pvs=4#2dc0f77693eb47e5a4aaa040126b74ee).
- [x] Create the required test cases
Part of the Github Vectorize (Summary). Please read this document before starting.
The following changes should be implemented in
dags/hivemind_etl_helpers/src/db/github/transform
.Note: file coverage should be 100%.