feat: add RetrieveAttributeFake implementation

[LarsBauer]

No description provided.

[github-actions]

Qodana Community for .NET

40 new problems were found

Inspection name	Severity	Problems
Redundant nullable warning suppression expression	🔶 Warning	3
Nullability of type argument doesn't match constraint type.	🔶 Warning	2
Use collection expression syntax	◽️ Notice	19
Inconsistent Naming	◽️ Notice	6
Convert delegate variable into local function	◽️ Notice	5
Use object or collection initializer when possible	◽️ Notice	5

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[LarsBauer]

@copilot check the Qodana problems and fix them. prepare the changes in a separate PR so we can review it before merging into this branch

[Copilot]

@LarsBauer I've opened a new pull request, #41, to work on those changes. Once the pull request is ready, I'll request review from you.

[github-actions]

🎉 This PR is included in version 1.1.0-beta.9 🎉

The release is available on:

• v1.1.0-beta.9
• GitHub release

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