buckets: make a copy of all event maps before pouring the event to a bucket

[blotus]

Fixes #4459.

This introduces additional allocations each time we pour an item to a bucket, but there's probably no way around this: the maps must be owned by each buckets.

As a side-effect, this also fixes a potential race conditions in the meta:

• Scenario A sets a new meta with evt.SetMeta
• Scenario B overflows
• The meta set by scenario A would appear in the meta of the alert generated by scenario B because the maps were shared between all buckets.

[github-actions]

@blotus: There are no 'kind' label on this PR. You need a 'kind' label to generate the release automatically.

• /kind feature
• /kind enhancement
• /kind refactoring
• /kind fix
• /kind chore
• /kind dependencies

Details

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[github-actions]

@blotus: There are no area labels on this PR. You can add as many areas as you see fit.

• /area agent
• /area local-api
• /area cscli
• /area appsec
• /area security
• /area configuration

Details

I am a bot created to help the crowdsecurity developers manage community feedback and contributions. You can check out my manifest file to understand my behavior and what I can do. If you want to use this for your project, you can check out the BirthdayResearch/oss-governance-bot repository.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 63.89%. Comparing base (5ce91a0) to head (60fe0aa).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4481      +/-   ##
==========================================
+ Coverage   63.88%   63.89%   +0.01%     
==========================================
  Files         478      478              
  Lines       34298    34307       +9     
==========================================
+ Hits        21911    21921      +10     
+ Misses      10231    10228       -3     
- Partials     2156     2158       +2     

Flag	Coverage Δ
bats	46.51% <100.00%> (+0.02%)	⬆️
unit-linux	37.33% <100.00%> (+0.08%)	⬆️
unit-windows	26.02% <100.00%> (+0.01%)	⬆️

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