[R] Implement lubridate's %m+%, %m-%, add_with_rollback, and addition and subtraction with timestamp

[asfimport]

Reporter: Nicola Crane / @thisisnic
Watchers: Rok Mihevc / @rok

Related issues:

• [C++] Support rolling backwards and forwards with temporal arithmetic (depends upon)
• [C++] Implement maths with timestamps (depends upon)
• [C++] Support temporal arithmetic ({time,date}{32,64}, timestamp, interval) (depends upon)

_{Note: This issue was originally created as ARROW-14948. Please see the migration documentation for further details.}