Possibility to do a partial reprocessing of a DAG

[NiltonDuarte]

The problem:
Currently, our examples are heavily dependent on dag_run.start_date as the metadata used for _ingestion_ts
And this add an issue that we can't have a partial reprocessing as the dag_run.start_date will be the start date of the reprocessing run and the framework wont be able to correctly find the parquet files on the currect directory _logical_ts={{ execution_date }}/_ingestion_ts={{ dag_run.start_date }}

[NiltonDuarte]

Using the XCom as done in the PR #34 in the bitcoin ingestion example solves this problem but I do not like the solution