fix: 🐛 list item can have other block as first children

[Saul-Mirone]

✅ Closes: #1276

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Summary

Allow list item to have other types of block as first child.

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CI

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Name	Status	Preview	Comments	Updated (UTC)
milkdown-storybook	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 6, 2024 9:29am

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[cypress]

Passing run #767 ↗︎

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Details:

Merge df46f50 into d408214...
Project: Default Project	Commit: 76347490f8 ℹ️
Status: Passed	Duration: 01:41 💡
Started: Apr 6, 2024 9:32 AM	Ended: Apr 6, 2024 9:33 AM

Review all test suite changes for PR #1300 ↗︎

[cypress]

Passing run #769 ↗︎

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Details:

fix: 🐛 list item can have other block as first children (#1300)
Project: Default Project	Commit: 5bc11d4690
Status: Passed	Duration: 01:51 💡
Started: Apr 6, 2024 9:36 AM	Ended: Apr 6, 2024 9:38 AM

Review all test suite changes for PR #1300 ↗︎