Table should be able to interrupt other blocks

[chenzhiguang]

• Make table be able to interrupt other blocks, such as paragraph, fix: https://github.com/dart-lang/markdown/issues/543

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• [x] I’ve reviewed the contributor guide and applied the relevant portions to this PR.

[coveralls]

Pull Request Test Coverage Report for Build 5030182912

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.06%) to 96.438%

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Totals
Change from base Build 5018452131:	0.06%
Covered Lines:	1516
Relevant Lines:	1572

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💛 - Coveralls