Vectorize parameter sampling

[lucaeg]

Vectorize the sampling rather than drawing one value at a time. This cosmetic change makes the code cleaner and easier to understand. In our view, drawing all samples for a parameter simultaneously is more natural and better aligned with standard sampling APIs (e.g., scipy).

• PR title captures the intent of the changes, and is fitting for release notes.
• Added appropriate release note label
• Commit history is consistent and clean, in line with the contribution guidelines.
• Make sure unit tests pass locally after every commit (git rebase -i main --exec 'just rapid-tests')

When applicable

• When there are user facing changes: Updated documentation
• New behavior or changes to existing untested code: Ensured that unit tests are added (See Ground Rules).
• Large PR: Prepare changes in small commits for more convenient review
• Bug fix: Add regression test for the bug
• Bug fix: Add backport label to latest release (format: 'backport release-branch-name')

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.63%. Comparing base (0ac0ce1) to head (32f7f1c).
⚠️ Report is 13 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #12648      +/-   ##
==========================================
- Coverage   90.66%   90.63%   -0.03%     
==========================================
  Files         429      431       +2     
  Lines       29802    30065     +263     
==========================================
+ Hits        27019    27250     +231     
- Misses       2783     2815      +32     

Flag	Coverage Δ
cli-tests	37.33% <100.00%> (-0.24%)	⬇️
gui-tests	68.69% <100.00%> (-0.69%)	⬇️
performance-and-unit-tests	74.04% <100.00%> (+0.11%)	⬆️
test	37.58% <7.69%> (-0.50%)	⬇️

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[codspeed-hq]

CodSpeed Performance Report

Merging this PR will not alter performance

_{Comparing vectorize-sample-prior (32f7f1c) with main (6995ffc)}

Summary

✅ 22 untouched benchmarks

[achaikou]

I am sorry to crash the party uninvited, but I was out of stuff to do 😊

I am also missing some context in the commit description about the reason for the change (is there some problem to be solved or would code just look nicer?), so I have to guess 😄

[achaikou]

Am I right to assume that all those commits would be squashed?
I am just more accustomed to the fixup commit style 🙂

Btw, I am happy with the changes, but I don't feel like an ert-adult yet to click the "Approve" button for this PR 😄