[R] Implement conversion from Type::UINT64 to R vector

[asfimport]

This case is not handled in array_to_vector.cpp

Reporter: Wes McKinney / @wesm
Assignee: Neal Richardson / @nealrichardson

PRs and other links:

• GitHub Pull Request #7455

_{Note: This issue was originally created as ARROW-9031. Please see the migration documentation for further details.}

[asfimport]

Neal Richardson / @nealrichardson:
Issue resolved by pull request 7455
#7455