Feature/data retention policy

[sebastian-ederer]

Description

Add support for retention policies and updated dependencies.

Type of Change

• Bug fix (non-breaking change adressing an issue)
• New feature (non-breaking change adding functionality)
• Refactoring
• Documentation
• CI / build / tooling
• Breaking change (fix or feature causing existing functionality to change)

Test Plan

• Unit tests added/updated
• Integration tests added/updated (Testcontainers)
• Existing tests pass (dotnet test)

Checklist

• Code follows the project's coding styles and guidelines
• I have updated the documentation accordingly
• I have added tests to cover my changes
• No new compiler warnings introduced
• Public API changes have XML documentation

[codecov]

Codecov Report

❌ Patch coverage is 94.88273% with 24 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...Scaffolding/RetentionPolicyScaffoldingExtractor.cs	90.24%	2 Missing and 6 partials ⚠️
...ation/RetentionPolicy/RetentionPolicyConvention.cs	84.61%	3 Missing and 3 partials ⚠️
...db/Generators/RetentionPolicyOperationGenerator.cs	95.83%	1 Missing and 4 partials ⚠️
...eatures/RetentionPolicies/RetentionPolicyDiffer.cs	94.11%	0 Missing and 3 partials ⚠️
...ration/RetentionPolicy/RetentionPolicyAttribute.cs	96.29%	0 Missing and 1 partial ⚠️
.../Eftdb/Internals/TimescaleMigrationsModelDiffer.cs	83.33%	1 Missing ⚠️

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