Allow ignoring version only changes in generated code

[bertold]

What do you want to change?

When using the sqlc diff command in a CI/CD pipeline to detect any divergence from the source schema files and the generated Go structs - there may be times when only the tool version change is detected. There is no way to differentiate between a case where there is true divergence.

What database engines need to be changed?

PostgreSQL

What programming language backends need to be changed?

Go