database: Add categories and keywords columns to the versions table

[Turbo87]

Similar to #9998, this PR adds two new columns to the versions database table: categories and keywords

These columns are filled with the corresponding values from the Cargo.toml file when new crates/versions are published.

Compared to the per-crate categories and keywords, these are not saved in dedicated crates_categories and crates_keywords tables, but just as a regular Postgres array column. The reason for this is that we don't need to find versions by category or keyword. We only need the data to set the new crate categories/keywords when the "default version" of a crate changes (will be implemented in a follow-up PR, once the data is backfilled in the database).

Related:

• Display most recently published version next to "last updated" time on crate show page #953
• keywords and description seems to come from the last published version not actual version. #7560
• Add description, homepage, documentation and repository fields for versions #9998

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.37%. Comparing base (f88a3eb) to head (bfc120d).
Report is 10 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10078      +/-   ##
==========================================
- Coverage   89.37%   89.37%   -0.01%     
==========================================
  Files         294      294              
  Lines       31283    31289       +6     
==========================================
+ Hits        27960    27965       +5     
- Misses       3323     3324       +1     

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