RFC for Sqlite3 Extended Error Codes

Hello, My apologies if I violate any netiquette during this e-mail. This is my first time doing something like this and I am following the guide from the CONTRIBUTING.md to the best of my ability. I would to extend the functionality of the current sqlite3 implementation (in *ext/sqlite3* and in *ext/pdo_sqlite*) by exposing the functions related to extended result codes. I have already forked and made my changes at https://github.com/rkopack/php-src/commit/f6c4d1eeccd27a3c5bd836fd8205b1283bd5eabc. From my understanding Scott MacVicar and Christoph M. Becker are the primary maintainers for the sqlite3 extension and Ilia Alshanetsky is the primary maintainer for the pdo_sqlite extension; if any of you would like to comment on this (it's around 50 lines of new code) so I can get feedback on this I would greatly appreciate it. I made sure to follow the convention I saw in the file(s) to the best of my ability but I am sure there are little things I might have missed. Thank you for your time, Robert Kopack