Add support for security barrier and invoker

[hiemanshu]

As mentioned in #432 for working with RLS, we need these flags to be set-able, so add it as a feature

[derekprior]

Any chance you could add some tests for the new functionality? Also, I'm not certain we're ready to drop support for Ruby < 3.1, so if you could update the hash literal syntax, that would be good until we decide that for sure.

[hiemanshu]

Any chance you could add some tests for the new functionality? Also, I'm not certain we're ready to drop support for Ruby < 3.1, so if you could update the hash literal syntax, that would be good until we decide that for sure.

Sounds good! I'll get some tests added later this week.