New proposal for instant experiment result data model

[hellais]

This implements: https://github.com/ooni/data/issues/42

[codecov[bot]]

Codecov Report

Attention: 171 lines in your changes are missing coverage. Please review.

Comparison is base (cb4eebd) 76.12% compared to head (6f628df) 80.92%.

:exclamation: Current head 6f628df differs from pull request most recent head 829a17b. Consider uploading reports for the commit 829a17b to get more accurate results

Files	Patch %	Lines
oonidata/analysis/website_experiment_results.py	77.14%	109 Missing :warning:
oonidata/dataviz/web.py	0.00%	31 Missing :warning:
oonidata/models/observations.py	9.09%	10 Missing :warning:
oonidata/workers/analysis.py	92.92%	7 Missing :warning:
oonidata/analysis/web_analysis.py	80.95%	4 Missing :warning:
oonidata/datautils.py	33.33%	2 Missing :warning:
oonidata/models/experiment_result.py	95.23%	2 Missing :warning:
oonidata/cli/command.py	80.00%	1 Missing :warning:
oonidata/db/connections.py	50.00%	1 Missing :warning:
...ata/transforms/nettests/measurement_transformer.py	80.00%	1 Missing :warning:
... and 3 more

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #43 +/- ## ========================================== + Coverage 76.12% 80.92% +4.80% ========================================== Files 69 69 Lines 5989 6067 +78 ========================================== + Hits 4559 4910 +351 + Misses 1430 1157 -273 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

[hellais]

Once ooni/data#44 is landed in here. I should be sure to merge this without squashing everything compacting all the above commits into one.

For the rationale behind this decision see this comment: https://github.com/ooni/data/pull/44#issuecomment-1820464447

[hellais]

The git history is now clean. This branch is ready for review.

[hellais]

I am going to land this into main to make progress on shipping this.