Update PredefinedMethodsHelper

[StefH]

No description provided.

[Copilot]

Pull Request Overview

This PR updates the PredefinedMethodsHelper and related parser components to enhance the handling of predefined method calls and improve test coverage. Key changes include:

• A new instance-based implementation for PredefinedMethodsHelper with a configurable dictionary of supported methods.
• Updated test cases in PredefinedMethodsHelperTests and MethodFinderTest, including renaming test methods for clarity.
• A refactoring in MethodFinder and ExpressionParser to accommodate the new method helper structure.

Reviewed Changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
test/System.Linq.Dynamic.Core.Tests/Parser/PredefinedMethodsHelperTests.cs	Added tests for various supported and unsupported method scenarios.
test/System.Linq.Dynamic.Core.Tests/Parser/MethodFinderTest.cs	Modified test cases with updated parameter types and method names.
src/System.Linq.Dynamic.Core/Parser/SupportedMethods/MethodFinder.cs	Renamed output parameter to "methodOrConstructor" for clarity.
src/System.Linq.Dynamic.Core/Parser/PredefinedMethodsHelper.cs	Transitioned from a static helper to an instance helper with a configurable supported methods dictionary.
src/System.Linq.Dynamic.Core/Parser/ExpressionParser.cs	Integrated the instance PredefinedMethodsHelper and updated method accessibility checks.
src/System.Linq.Dynamic.Core/DynamicClassFactory.cs	Updated the call to use the new ObjectInstanceToString property.

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