Revert "Unused methods, module, etc."

This reverts commit 4e05bfb8e254c3360a3ca4a6cb332995314338fe.

Reason: BlankTopic#blank? should not be removed to check that dynamic finder with a bang can find a model that responds to `blank?`
Describing the reason for defining BlankTopic#blank? which will never be called
Default dead_connection_timeout to 5

or the ConnectionPool silently fails to close connections inside the Thread