Add overload of ContainSubtree that takes a config

[labsin]

Adds a ContainSubtree overload with the Func<IJsonAssertionOptions<object>, IJsonAssertionOptions<object>> config parameter analogue with the BeEquivalentTo methods.

Fixes #78

[Copilot]

Pull Request Overview

This PR adds a new ContainSubtree overload that accepts a configuration function parameter, providing users with more control over JSON assertion options similar to the existing BeEquivalentTo methods. This enhancement addresses issue #78 by allowing custom assertion configurations when checking JSON subtrees.

• Adds a new ContainSubtree method overload with configurable assertion options
• Includes comprehensive test coverage for float approximation scenarios
• Updates XML documentation parameter name for clarity

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
Src/FluentAssertions.Json/JTokenAssertions.cs	Adds new ContainSubtree overload with config parameter and fixes XML doc parameter name
Tests/FluentAssertions.Json.Specs/JTokenAssertionsSpecs.cs	Adds test cases for float approximation using the new ContainSubtree overload

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[dennisdoomen]

Just a couple of minor suggestions. You do need to update the snapshot tests using the AcceptApiChanges.ps1 to make the build green.

Also, apologies for the late review.

[labsin]

I also removed the bad copy-paste example doc and the misplaced end tag that the AI noticed

[jnyrup]

The API update wasn't successful.
I guess you need to compile the project before running AcceptChanges.

Besides that - the changes look good.