rr_rsf: Download a register RSF file
In nacnudus/registr: Use the UK Government Registers API

Either downloads the Register Serialisation Format (RSF) file of a register, constructing the URL from the name of the register and the given phase, or reads it from disk. Optionally saves it to disk.

1 2	rr_rsf(name = NULL, phase = c("beta", "alpha", "discovery"), file = NULL, write = FALSE, dest_path = NULL, quiet = FALSE)

`name`	Character, the name of the register.
`phase`	Character, one of `"beta"`, `"alpha"`, and `"discovery"`
`file`	Character, file path or URL, passed on to `readr::read_lines()` if `name` is not provided.
`write`	Logical, whether to write the RSF file to disk. If `TRUE`, either `name` or `dest_path` must be provided.
`dest_path`	Character, path and file name to write the RSF to.
`quiet`	Logical, if `TRUE` does not print messages to the console.