Allow for pattern matching with the IsSelectedAttribute.

[michaelstaib]

This PR allows for more complex selection expressions with the is selected attribute. Now we can match for patterns instead of single fields.

public User GetUser([IsSelected("email category { ... on Category { next { name } } }")] bool isSelected)

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 31.50685% with 100 lines in your changes are missing coverage. Please review.

Project coverage is 72.13%. Comparing base (38de4ac) to head (a2c1f1a). Report is 1 commits behind head on main.

:exclamation: Current head a2c1f1a differs from pull request most recent head 056b235. Consider uploading reports for the commit 056b235 to get more accurate results

Files	Patch %	Lines
...re/src/Execution/Processing/SelectionCollection.cs	0.00%	58 Missing :warning:
...Parameters/IsSelectedParameterExpressionBuilder.cs	0.00%	22 Missing :warning:
...HotChocolate/Core/src/Types/SchemaBuilder.Setup.cs	78.26%	5 Missing :warning:
...xecution/Processing/MiddlewareContext.Selection.cs	0.00%	4 Missing :warning:
.../src/Types/Types/Attributes/IsSelectedAttribute.cs	0.00%	4 Missing :warning:
...c/Execution/Processing/EmptySelectionCollection.cs	0.00%	3 Missing :warning:
.../Types/Configuration/Validation/SchemaValidator.cs	60.00%	2 Missing :warning:
...nfiguration/Validation/ObjectTypeValidationRule.cs	75.00%	1 Missing :warning:
...sions/ProjectionObjectFieldDescriptorExtensions.cs	66.66%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #7061 +/- ## ========================================== + Coverage 72.11% 72.13% +0.01% ========================================== Files 2621 2616 -5 Lines 130781 130609 -172 ========================================== - Hits 94316 94218 -98 + Misses 36465 36391 -74 ``` | [Flag](https://app.codecov.io/gh/ChilliCream/graphql-platform/pull/7061/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ChilliCream) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/ChilliCream/graphql-platform/pull/7061/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ChilliCream) | `72.13% <31.50%> (+0.01%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ChilliCream#carryforward-flags-in-the-pull-request-comment) to find out more.

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Qodana for .NET

3 new problems were found

Inspection name	Severity	Problems
Return type of a function can be non-nullable	🔶 Warning	1
Type member is never used (private accessibility)	🔶 Warning	1
Unused parameter (private accessibility)	🔶 Warning	1

💡 Qodana analysis was run in the pull request mode: only the changed files were checked ☁️ View the detailed Qodana report

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