Add an `AnyViewSequence` which is analogous to the AnyView for ViewSequences#158

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Philipp-M wants to merge 2 commits intolinebender:mainfrom Philipp-M:any-viewsequence

+184-48

Commits on Dec 30, 2023

Added a AnyViewSequence which is analogous to the AnyView for ViewSequences
Philipp-M
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Commits on Jan 3, 2024

xilem_html: Use type erased viewsequences instead of static types for the element views
Philipp-M
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