[R] Break-up as_date and as_datetime into individual functions

A follow-up from [ARROW-15800](https://issues.apache.org/jira/browse/ARROW-15800).
See also: https://github.com/apache/arrow/pull/12738#discussion_r854329903

**Reporter**: [Dragoș Moldovan-Grünfeld](https://issues.apache.org/jira/browse/ARROW-16257) / @dragosmg
**Assignee**: [Dragoș Moldovan-Grünfeld](https://issues.apache.org/jira/browse/ARROW-16257) / @dragosmg
#### PRs and other links:
- [GitHub Pull Request #12738](https://github.com/apache/arrow/pull/12738)

<sub>**Note**: *This issue was originally created as [ARROW-16257](https://issues.apache.org/jira/browse/ARROW-16257). Please see the [migration documentation](https://github.com/apache/arrow/issues/14542) for further details.*</sub>

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[R] Break-up as_date and as_datetime into individual functions #31651

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[R] Break-up as_date and as_datetime into individual functions #31651

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