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ARROW-18345: [R] Create a CRAN-specific packaging checklist that lives in the R package directory (#14678)

A first stab at documenting the post-Arrow-release/pre-CRAN submission process! Builds on excellent documentation on the Confluence page ( https://cwiki.apache.org/confluence/display/ARROW/Release+Management+Guide#ReleaseManagementGuide-UpdatingRpackages ) but in a more "checklisty" form to make sure we don't miss steps.

Lead-authored-by: Dewey Dunnington <dewey@fishandwhistle.net>
Co-authored-by: Dewey Dunnington <dewey@voltrondata.com>
Co-authored-by: Nic Crane <thisisnic@gmail.com>
Co-authored-by: Neal Richardson <neal.p.richardson@gmail.com>
Signed-off-by: Dewey Dunnington <dewey@fishandwhistle.net>