feat: Add Sqllite json_valid

[dhirensr]

Related to #4366

also I couldn't test the functionality fully, and I've asked a question related to testing in #4463

[weiznich]

Thanks for opening this PR and sorry for taking some days to get back with hints what's wrong here.

The implementation is already on a good way, there are only minor nits that needs to be fixed to run the tests + make this good to merge.

[dhirensr]

@weiznich : thank you for reviewing. I can make the changes quickly but facing some errors in testing the change. I tried asking the testing mechanism here : #4463

can you please help? it will be helpful for me in next couple of pull requests.

[weiznich]

I'm sorry that it looks like #4463 was not answered. From my point of view the issues outlined there were addressed with the earlier set of comments here.

There was a new set of errors in the relevant doc test, which was essentially caused by the set of comments above being not 100% complete in what needed to be changed. I've now pushed 6399f89 to fix these issues, as they were really only minimal syntax errors.

I've also rebased the PR and pushed 128ffba to pull in recent changes from the master branch.

Thanks again for contributing ❤️