fix(nextcloud)!: Move all query parameters to body to fix many serialization problems

[provokateurin]

Depends on nextcloud/openapi-extractor#105

I can't even begin to list all the problems this solves 😅
There were quite some bugs in the way we serialized and encoded request bodies and how we handle default values in those cases. I wasn't really able to separate the fixes, so I hope this is ok.

We can also already merge the dynamite fixes and stash the nextcloud changes until the openapi-extractor PR is merged (which could be very soon already as there is only one minor blocker with the ocs_api_viewer).

[provokateurin]

CI failure is due to the bloc tests not being migrated.

[codecov]

Codecov Report

Attention: Patch coverage is 55.69137% with 580 lines in your changes missing coverage. Please review.

Project coverage is 29.59%. Comparing base (7673cea) to head (64cedb2).
Report is 5 commits behind head on main.

❗ Current head 64cedb2 differs from pull request most recent head db36e48

Please upload reports for the commit db36e48 to get more accurate results.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2129      +/-   ##
==========================================
- Coverage   30.73%   29.59%   -1.14%     
==========================================
  Files         259      260       +1     
  Lines       85163    95000    +9837     
==========================================
+ Hits        26174    28115    +1941     
- Misses      58989    66885    +7896     

Flag	Coverage Δ		*Carryforward flag
cookie_store	90.51% <ø> (ø)		Carriedforward from 7de05bf
dynamite	31.01% <0.00%> (-0.07%)	⬇️
dynamite_end_to_end_test	61.06% <66.51%> (-0.29%)	⬇️
dynamite_runtime	85.40% <ø> (ø)		Carriedforward from 7de05bf
neon_dashboard	96.22% <100.00%> (+0.17%)	⬆️
neon_framework	43.43% <86.66%> (-0.52%)	⬇️
neon_notifications	100.00% <ø> (ø)
neon_talk	98.81% <97.05%> (-0.08%)	⬇️
nextcloud	26.11% <46.17%> (-0.94%)	⬇️
sort_box	90.90% <ø> (ø)		Carriedforward from 7de05bf

*This pull request uses carry forward flags. Click here to find out more.

Files	Coverage Δ
...namite_end_to_end_test/lib/parameters.openapi.dart	78.76% <100.00%> (ø)
...s/neon/neon_dashboard/lib/src/blocs/dashboard.dart	100.00% <100.00%> (ø)
packages/neon/neon_talk/lib/src/blocs/room.dart	97.79% <100.00%> (+0.11%)	⬆️
.../neon/neon_talk/lib/src/widgets/message_input.dart	95.04% <100.00%> (-0.61%)	⬇️
...talk/lib/src/widgets/rich_object/file_preview.dart	100.00% <100.00%> (ø)
...s/neon_framework/lib/src/blocs/unified_search.dart	100.00% <100.00%> (ø)
...ages/neon_framework/lib/src/blocs/user_status.dart	95.50% <100.00%> (+0.63%)	⬆️
...s/neon_framework/lib/src/blocs/weather_status.dart	100.00% <100.00%> (ø)
...es/neon_framework/lib/src/testing/mock_server.dart	88.88% <100.00%> (-2.78%)	⬇️
packages/nextcloud/lib/src/api/core.openapi.dart	43.21% <ø> (-0.34%)	⬇️
... and 24 more

... and 20 files with indirect coverage changes

[provokateurin]

Ready for review, openapi-extractor PR was merged 🚀

[Leptopoda]

There is nothing really against this. I'm not a big fan of the double __ but this can later be changed in a non breaking update.

Approving to not block this further