Inform messages respecting the global AEME.inform option

Usage

cli_inform_safe(..., .envir = parent.frame())

...: arguments passed to cli_inform_safe()
.envir: environment in which to evaluate {} expressions in the message. Defaults to the calling environment, matching cli::cli_inform(). Forwarded explicitly because otherwise cli would interpolate against this wrapper's frame, where the caller's locals do not exist.