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ARROW-9807: [R] News update/version bump post-1.0.1

Since the patch release won't get merged to master, we need to bump the R package dev versions manually. This patch also fills in some NEWS.md bullets for recently merged improvements.

Closes #8013 from nealrichardson/r-post-1.0.1

Authored-by: Neal Richardson <neal.p.richardson@gmail.com>
Signed-off-by: Neal Richardson <neal.p.richardson@gmail.com>