[lexical] Add tests for HTMLConfig

[2wheeh]

EDIT:
This adds tests for HTMLConfig

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Name	Status	Preview	Comments	Updated (UTC)
lexical	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 25, 2024 1:55pm
lexical-playground	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 25, 2024 1:55pm

[github-actions]

size-limit report 📦

Path	Size
lexical - cjs	29.38 KB (0%)
lexical - esm	29.24 KB (0%)
@lexical/rich-text - cjs	37.89 KB (0%)
@lexical/rich-text - esm	31.07 KB (0%)
@lexical/plain-text - cjs	36.49 KB (0%)
@lexical/plain-text - esm	28.41 KB (0%)
@lexical/react - cjs	39.61 KB (0%)
@lexical/react - esm	32.52 KB (0%)

[etrepum]

I like that this adds tests but it does let you write incorrect code that passes the type checker because really what we would want to say is that the key and value of the map are related (something like forall T extends LexicalNode. [K: Klass<T>, V: (editor: LexicalEditor, target: T) => DOMExportOutput] but I don't think it would be possible to express something like that directly with Map's type

[2wheeh]

I don't think it would be possible to express something like that directly with Map's type

@etrepum You are right. I reverted that and changed this PR to focus on adding unit tests for HTMLConfig.

[etrepum]

Thank you!