feat: update create suggestion endpoint to PUT

[gabrielmbmb]

Description

This PR updates the POST create suggestion endpoint added in #3304 to be a PUT endpoint instead that allows creating a suggestion for a given combination of question + record (if it doesn't exist) or update an existing one:

• The endpoint will return a 201 when the suggestion is created
• The endpoint will return a 200 when the suggestion existed and it has been updated.

Also, this PR updates the Suggestion SQLAlchemy ORM model adding a new unique constraint for record id and question id. As the migration file added in #3304 to create the suggestions table has not been applied yet in any prod environment, just in dev.argilla.io, I modified the migration file to include this unique constraint. Before deploying these changes in dev.argilla.io we will need to:

1. Revert the migration
2. Apply the latest migration

Type of change

• New feature (non-breaking change which adds functionality)
• Breaking change

How Has This Been Tested

Manually in a local environment and I've added unit tests.

Checklist

• I added relevant documentation
• follows the style guidelines of this project
• I did a self-review of my code
• I made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• I filled out the contributor form (see text above)
• I have added relevant notes to the CHANGELOG.md file (See https://keepachangelog.com/)

[frascuchon]

Just a comment regarding the new schema

[codecov]

Codecov Report

Patch coverage: 94.71% and project coverage change: +0.22 🎉

Comparison is base (6630d7b) 90.13% compared to head (78f2362) 90.36%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3391      +/-   ##
===========================================
+ Coverage    90.13%   90.36%   +0.22%     
===========================================
  Files          233      243      +10     
  Lines        12493    12939     +446     
===========================================
+ Hits         11261    11692     +431     
- Misses        1232     1247      +15     

Flag	Coverage Δ
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Impacted Files	Coverage Δ
...ack/integrations/huggingface/card/_dataset_card.py	100.00% <ø> (ø)
.../feedback/integrations/huggingface/card/_parser.py	100.00% <ø> (ø)
src/argilla/feedback/__init__.py	100.00% <ø> (ø)
src/argilla/tasks/database/migrate.py	39.13% <ø> (-4.87%)	⬇️
src/argilla/training/autotrain_advanced.py	0.00% <0.00%> (ø)
src/argilla/utils/telemetry.py	89.09% <ø> (ø)
src/argilla/server/settings.py	77.65% <50.00%> (-3.52%)	⬇️
src/argilla/server/database.py	75.00% <63.63%> (-25.00%)	⬇️
...lient/feedback/integrations/huggingface/dataset.py	86.80% <86.80%> (ø)
src/argilla/client/feedback/dataset.py	79.86% <90.00%> (-2.36%)	⬇️
... and 64 more

... and 6 files with indirect coverage changes

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[alvarobartt]

LGTM! Feel free to merge 👍🏻