Database abstractions for Golang

Assembled, a company that has been using Golang as its exclusive backend language since 2018, has developed three abstractions to address the challenges of database access in Golang. These abstractions include an interface for sharing code between single- and multi-row getters, a helper method to handle errors and close rows when scanning from the database, and an interface for sharing code between transactions and non-transactions. These abstractions improve query performance, ensure proper handling of database connections, and facilitate code reuse in different contexts.