Update contributing guidelines for copyright headers

[yurishkuro]

Added guidelines for copyright headers in new files and modifications.

[github-actions]

Metrics Comparison Summary

Total changes across all snapshots: 0

Detailed changes per snapshot

summary_metrics_snapshot_cassandra

📊 Metrics Diff Summary

Total Changes: 0

• 🆕 Added: 0 metrics
• ❌ Removed: 0 metrics
• 🔄 Modified: 0 metrics
• 🚫 Excluded: 53 metrics

summary_metrics_snapshot_cassandra

📊 Metrics Diff Summary

Total Changes: 0

• 🆕 Added: 0 metrics
• ❌ Removed: 0 metrics
• 🔄 Modified: 0 metrics
• 🚫 Excluded: 106 metrics

summary_metrics_snapshot_cassandra

📊 Metrics Diff Summary

Total Changes: 0

• 🆕 Added: 0 metrics
• ❌ Removed: 0 metrics
• 🔄 Modified: 0 metrics
• 🚫 Excluded: 53 metrics

summary_metrics_snapshot_cassandra

📊 Metrics Diff Summary

Total Changes: 0

• 🆕 Added: 0 metrics
• ❌ Removed: 0 metrics
• 🔄 Modified: 0 metrics
• 🚫 Excluded: 106 metrics

➡️ View full metrics file

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.51%. Comparing base (aa617a6) to head (40ddd55).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7877      +/-   ##
==========================================
+ Coverage   95.50%   95.51%   +0.01%     
==========================================
  Files         305      305              
  Lines       16174    16174              
==========================================
+ Hits        15447    15449       +2     
+ Misses        570      568       -2     
  Partials      157      157              

Flag	Coverage Δ
badger_v1	9.19% <ø> (ø)
badger_v2	1.94% <ø> (ø)
cassandra-4.x-v1-manual	13.59% <ø> (ø)
cassandra-4.x-v2-auto	1.93% <ø> (ø)
cassandra-4.x-v2-manual	1.93% <ø> (ø)
cassandra-5.x-v1-manual	13.59% <ø> (ø)
cassandra-5.x-v2-auto	1.93% <ø> (ø)
cassandra-5.x-v2-manual	1.93% <ø> (ø)
clickhouse	1.98% <ø> (?)
elasticsearch-6.x-v1	17.54% <ø> (ø)
elasticsearch-7.x-v1	17.58% <ø> (ø)
elasticsearch-8.x-v1	17.73% <ø> (ø)
elasticsearch-8.x-v2	1.94% <ø> (ø)
elasticsearch-9.x-v2	1.94% <ø> (ø)
grpc_v1	8.85% <ø> (ø)
grpc_v2	1.94% <ø> (ø)
kafka-3.x-v2	1.94% <ø> (ø)
memory_v2	1.94% <ø> (ø)
opensearch-1.x-v1	17.62% <ø> (ø)
opensearch-2.x-v1	17.62% <ø> (ø)
opensearch-2.x-v2	1.94% <ø> (ø)
opensearch-3.x-v2	1.94% <ø> (ø)
query	1.94% <ø> (ø)
tailsampling-processor	0.55% <ø> (ø)
unittests	94.16% <ø> (+0.01%)	⬆️

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