fix: not logging OpenAPI queries

Closes https://github.com/PostgREST/postgrest/issues/4226.

This requires moving query generation to the top App.hs module.

At this point is also simple to log the transaction variables + the
pre-request function call but this is not done here to reduce scope.

CHANGELOG.md

@@ -5,6 +5,10 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 
 ## Unreleased
 
+### Fixed
+
+- Fix not logging OpenAPI queries when `log-query=main-query` is enabled by @steve-chavez in #4226
+
 ### Added
 
 - Improve the `PGRST106` error when the requested schema is invalid by @laurenceisla in #4089