fix: add bind_key parameter support to all adapter configurations

[cofin]

Fixes the missing bind_key parameter support across all database adapter configurations

Backward Compatibility

✅ Existing code continues to work unchanged:

# Existing code (no bind_key) - defaults to None
config = AiosqliteConfig(pool_config={"database": ":memory:"})
assert config.bind_key is None

# New CLI code (explicit bind_key)
config = AiosqliteConfig(
    pool_config={"database": ":memory:"}, 
    bind_key="my_database"
)
assert config.bind_key == "my_database"

Fixes CLI configuration loading and ensures consistent bind_key support across all database adapters as part of the configuration protocol.