Implement driver.SessionResetter and driver.Validator so that conns are retained in database/sql pools

We are missing implementations for [driver.Validator](https://pkg.go.dev/database/sql/driver@go1.20.4#Validator) and [driver.SessionResetter](https://pkg.go.dev/database/sql/driver@go1.20.4#SessionResetter) that are required in order for connections that have errored to be returned to database/sql connection pools.