Update the `name = ...` argument of `define_analysis()` to a table of candidate values as specified by choices

[LittleBeannie]

The current define_analysis() function's name = ... argument accepts any values.

In this issue, we will make it only accept a table of candidate values as specified by choices.

define_analysis <- function(meta, name = c("ae_summary", "ae_specific", "ae_forestly", "boxly", 
                                           "base_char", "trt_compliance", "disposition", "base_char_subgroup", 
                                           "km_curvely", "hr_forestly")) {
   name <- match.arg(name)
...
}

[elong0527]

We should not restrict it in metalite as it triggers cycle dependency and limited extension of metalite.

If an org would like to limit the name used in define_analysis or other places, a better approach is to create an org-specific validation function (outside of metalite) to validate the output of meta_build.