Add SendableItemMetadata

[claucambra]

Part of Swift 6 migration

Allows way of providing item metadata across NCFPK in a fully thread-safe manner

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 91.00257% with 70 lines in your changes missing coverage. Please review.

Project coverage is 78.90%. Comparing base (6491529) to head (0c68266).
Report is 30 commits behind head on main.

Files with missing lines	Patch %	Lines
...xtcloudFileProviderKit/Metadata/ItemMetadata.swift	88.37%	30 Missing ⚠️
Sources/NextcloudFileProviderKit/Item/Item.swift	49.01%	26 Missing ⚠️
...ces/NextcloudFileProviderKit/Item/Item+Fetch.swift	50.00%	4 Missing ⚠️
...ileProviderKit/Database/FilesDatabaseManager.swift	90.00%	3 Missing ⚠️
...roviderKit/Enumeration/Enumerator+SyncEngine.swift	85.71%	2 Missing ⚠️
...es/NextcloudFileProviderKit/Item/Item+Create.swift	93.93%	2 Missing ⚠️
...es/NextcloudFileProviderKit/Item/Item+Modify.swift	83.33%	2 Missing ⚠️
...FileProviderKit/Extensions/NKFile+Extensions.swift	98.61%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #44      +/-   ##
==========================================
+ Coverage   78.80%   78.90%   +0.09%     
==========================================
  Files          49       50       +1     
  Lines       10913    10839      -74     
==========================================
- Hits         8600     8552      -48     
+ Misses       2313     2287      -26     

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