Add unit testing for package `sql_datasource`

Add unit testing for internal/stackql/datasource/sql_data_source.

Acceptance Criteria:

• 85% unit test coverage.

I'd love for this to be assigned to me. Thanks!

@willmadison done, many thanks in advance

@general-kroll-4-life can I submit a PR. I have it ready

@EraKin575 yes please submit a pull request using a fork of this repository. We will review and run the checks after you have done that. Thanks for contributing 😎

Hey, I would like to work on this issue. I'm new to open source, can you please guide me how should I unit testing for the given directory, like what all steps should I follow after cloning the repo. Could you please guide me through :D

can i work on this issue?

Sure @Iqbalabdi