Chore: change className props in TreeView component to optional

[reekystive]

Description

The <TreeView /> component is primarily intended for debugging, but currently, all of its props are required. It would be more convenient if the className prop were optional.

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
lexical	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 21, 2024 11:43pm
lexical-playground	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 21, 2024 11:43pm

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[github-actions]

size-limit report 📦

Path	Size
lexical - cjs	29.38 KB (0%)
lexical - esm	29.24 KB (0%)
@lexical/rich-text - cjs	37.74 KB (0%)
@lexical/rich-text - esm	31.05 KB (0%)
@lexical/plain-text - cjs	36.41 KB (0%)
@lexical/plain-text - esm	28.42 KB (0%)
@lexical/react - cjs	39.64 KB (0%)
@lexical/react - esm	32.51 KB (0%)