Handle sqlite connection in MetaRepo

src/sakia/data/repositories/meta.py

src/sakia/data/repositories/nodes.py

src/sakia/tests/unit/data/test_blockchains_repo.py

src/sakia/tests/unit/data/test_certifications_repo.py

src/sakia/tests/unit/data/test_communities_repo.py

src/sakia/tests/unit/data/test_identies_repo.py

src/sakia/tests/unit/data/test_nodes_repo.py