Add method to perform all sql tests via FFI wrapped functions

[timsaucer]

Is your feature request related to a problem or challenge?

As a follow on to the function work in #14562 we should add a way to run all of the existing tests through the FFI interface. This would give far greater confidence that the tests work as expected.

Describe the solution you'd like

It would be great to make a special session context that does not register any functions at all. Instead we grab all the default functions, turn them into FFI variants and then Foreign functions, and register those. Then run all tests using that session context to validate they all work as expected.

Describe alternatives you've considered

Continue building unit tests in FFI one by one

Additional context

No response