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[R] Preserve data frame metadata in round trip #25366

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ARROW-8899 collects R attributes from the columns of a data.frame (including recursively in data frame columns), adds them to arrow schema metadata, and restores them when pulling a data frame into R. However, any attributes on the outer data frame itself are not preserved. These are lost in some autosplice magic code before AddMetadataFromDots can collect it.

Reporter: Neal Richardson / @nealrichardson
Assignee: Romain Francois / @romainfrancois

PRs and other links:

Note: This issue was originally created as ARROW-9271. Please see the migration documentation for further details.

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