[R] Register `nse_funcs` requiring indirect mapping

[asfimport]

• register each binding with and without the pkg:: prefix
• add / update unit tests for the nse_funcs bindings to include at least one pkg::fun() call for each binding

Reporter: Dragoș Moldovan-Grünfeld / @dragosmg
Assignee: Dragoș Moldovan-Grünfeld / @dragosmg

_{Note: This issue was originally created as ARROW-16889. Please see the migration documentation for further details.}