feat: support table/column lineage for mysql backend

[xuan616]

Summary of Changes

The change is related to issue #2072. It is about supporting table/column lineage for mysql backend end to end.

• databuilder: updated table_lineage model for table/column lineage record iterator and the corresponding sample_data_loader_mysql.py
• metadata_service: updated mysql_proxy.py to add lineage related endpoint.

Tests

Added unit tests in both databuilder and metadata_service for lineage related change.

Documentation

N/A

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[feng-tao]

thanks @xuan616