refactor: remove pico.space.* wrappers

src/lib.rs

test/int/test_cas.py

test/int/test_compaction.py

test/int/test_couple.py

test/int/test_expelling.py

test/int/test_joining.py

test/int/test_migration.py

test/int/test_network_effects.py

test/int/test_replication.py

test/int/test_snapshot.py