[R] Support to collect int64 as ints

[asfimport]

Reporter: Javier Luraschi / @javierluraschi

Related issues:

• [R] Error when losing data on int64, uint64 conversions to double (is related to)

PRs and other links:

• GitHub Pull Request #2834

_{Note: This issue was originally created as ARROW-3604. Please see the migration documentation for further details.}

[asfimport]

Neal Richardson / @nealrichardson:
Judging from the old PR, looks like it was decided that we weren't going to do this and would require users to cast explicitly. Please reopen or open a new issue if there's support to be done around that.