fix(chunker): included content layers

[Vdaleke]

Fix the use of content layers in HierarchicalChunker and HybridChunker.

Add new tests with passing the additional Furniture layer to MarkdownParams.

Resolves #592

[mergify]

Merge Protections

🔴 1 of 2 protections blocking · waiting on 👀 reviews

	Protection	Waiting on
🔴	Require two reviewer for test updates	👀 reviews
🟢	Enforce conventional commit	—

🔴 Require two reviewer for test updates

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• #approved-reviews-by >= 2

This rule is failing.

When test data is updated, we require two reviewers

• #approved-reviews-by >= 2

---

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🟢 Enforce conventional commit

Make sure that we follow https://www.conventionalcommits.org/en/v1.0.0/

• title ~= ^(fix|feat|docs|style|refactor|perf|test|build|ci|chore|revert)(?:\(.+\))?(!)?:

[github-actions]

✅ DCO Check Passed

Thanks @Vdaleke, all your commits are properly signed off. 🎉

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[Vdaleke]

Hello @ceberam, this PR is similar to yours #518, could you review it?

[Vdaleke]

@dolfim-ibm, @ceberam really need this feature, could you assign someone to this PR and issue?