Parse an RStudio calendar-version string into a numeric_version()
Source: R/programs.R
parse_rstudio_version_string.RdRStudio version strings look like "2026.08.2+200". numeric_version()
accepts - (like .) as a component separator but not +, so + is
normalized to - to keep the build number as a 4th version component.
Value
A numeric_version() object, or NULL if x has no match.