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GH-37994: [R] Create wrapper functions for the CSV*Options classes  (#37995)

### Rationale for this change

It's hard to find the docs for the R6 objects for the CSV reading/writing etc options classes

### What changes are included in this PR?

Create wrapper functions, which are more easily documented

### Are these changes tested?

Yep, I've swapped some existing tests to using the wrappers

### Are there any user-facing changes?

Yes
* Closes: #37994

Authored-by: Nic Crane <thisisnic@gmail.com>
Signed-off-by: Nic Crane <thisisnic@gmail.com>