Fix the loading time of puzzle list

This merge request should improve the performance of the puzzle list page on Pupple. It is ensured in two ways:

1. The controller no longer fetches the list of all puzzles from the database, but only a portion of the data that is displayed on the given page (i.e. 14 rows instead of 150 and going up)
2. Non-blocking calls using puzzleAttemptService are no longer blocked in a loop (which defeated the whole purpose of having them non-blocking), now Mono.when is used instead to wait for all tasks to finish simultaneously.

Furthermore a DTO is used, which might improve performance, but not as significantly.

I've checked the changes manually and they seem to not break anything while (potentially) improving performance.

Changelog:

## [0.0.4]

### Added

### Changed

- Pass a single DTO instead of multiple HashMap inside PuzzleList.html ( @cbaraya)

- Fetch only the puzzles from the database that will be used ( @kradziwilowicz)

### Fixed

- Made retrieving display names no longer block to increase performance ( @kradziwilowicz)

added priohigh label

Actually I think I used Mono.when wrong (I should probably also call a block() on it). Please do not merge until I give an update.

changed the description

I did not put the changelog inside the proper file, because it will cause a merge conflict with the one from [0.0.3] in the other MR.

Actually I do call block(), so it should be fine.

added 9 commits

• 5fe5b906...5e3deed0 - 4 commits from branch development
• 48ac72aa - Might fix the load time on puzzle overview
• 94555309 - Use a dataobject instead for the all puzzles overview
• d54fdf04 - Also used a data object for the profile page
• f21df22d - Removed the creator collumn from profiles, since it is redundant
• 4e7ae1ba - Fix the loading time of puzzle list

Compare with previous version

enabled an automatic merge when the pipeline for 4e7ae1ba succeeds

mentioned in commit bce3d1a0

merged