46411: sql,stmtdiagnostics: fix startup bug, extract subpackage for stmtdiagnostics r=ajwerner a=ajwerner
This PR comes in 2 commits. The first is a critical bug fix for #46410 whereby queries could be issued before the server has started up. The second is aesthetic. The statement diagnostics registry deserves its own package; sql is a mess already, no need to make it worse.
Release justification: bug fixes and low-risk updates to new functionality
46423: Add Marcus to AUTHORS r=mgartner a=mgartner
Add myself to the AUTHORS file as part of onboarding.
Release justification: no code changes
Co-authored-by: Andrew Werner <[email protected]>
Co-authored-by: Marcus Gartner <[email protected]>