Implement class drilling.

Closes #3334615

added 6 commits

• 39b57a5b...56e49ce9 - 3 commits from branch project:8.x-1.x
• 0cb5e2b6 - Implement class drilling.
• e2d6a7cf - Issue #3334615 by Grimreaper: Add tests
• c9a3fa5f - Issue #3334615 by Grimreaper: Coe quality

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I found a bug, not sure if it was also present before.

In Layout Builder, If I add a class in "block content" of a basic block, The class is correctly added to the body field of the block content entity but there is also an empty div with the class.

added 5 commits

• b2450ef3 - 1 commit from branch project:8.x-1.x
• 9baca744 - Implement class drilling.
• 6396332f - Issue #3334615 by Grimreaper: Add tests
• d7ac581a - Issue #3334615 by Grimreaper: Coe quality
• 8ac5beeb - Issue #3334615 by Grimreaper, lexbritvin: Update documentation.

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added 1 commit

• 9ec071f7 - Issue #3334615 by Grimreaper: Failing test

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• ab71e9b1 - Issue #3334615 by Grimreaper: Failing test

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• 02b9aafa - Issue #3334615 by Grimreaper: Fix empty layout builder

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added 1 commit

• cb986ac8 - Issue #3334615 by grimreaper, lexbritvin, pdureau: Wrapper / item behavior consolidation

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• 39f100e1 - Issue #3334615 by grimreaper, lexbritvin, pdureau: Wrapper / item behavior consolidation

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merged