bpo-30262: Don't expose sqlite Cache and Statement

[palaviv]

https://bugs.python.org/issue30262

[mention-bot]

@palaviv, thanks for your PR! By analyzing the history of the files in this pull request, we identified @Yhg1s, @benjaminp and @loewis to be potential reviewers.

[matrixise]

Hi @palaviv

Would you be interested to upgrade your PR to the last master?

Thank you

[berkerpeksag]

@palaviv if you port the NEWS entry to blurb, and add a note to Doc/whatsnew/3.8.rst, I can merge this PR. Thank you!

[bedevere-bot]

A Python core developer has requested some changes be made to your pull request before we can consider merging it. If you could please address their requests along with any other requests in other reviews from core developers that would be appreciated.

Once you have made the requested changes, please leave a comment on this pull request containing the phrase I have made the requested changes; please review again. I will then notify any core developers who have left a review that you're ready for them to take another look at this pull request.

[palaviv]

Done @berkerpeksag. I am happy to see that there is a new interest in the sqlite3 module :)

[palaviv]

I have made the requested changes; please review again

[bedevere-bot]

Thanks for making the requested changes!

@berkerpeksag: please review the changes made to this pull request.

[berkerpeksag]

Thank you!

@palaviv your pull requests have been on my TODO list, but unfortunately I've been pretty busy with life lately. Sorry for my late response times!

[palaviv]

Thank you @berkerpeksag. I saw you took charge on the sqlite3 module. I am very familiar with the code there and would love to help if needed.