Validates the URL, loads the azure extension, then registers the dataset
as a VIEW over read_json_auto(). Use az_conn() first if the connection
needs an Azure secret. Returns conn invisibly — use tbl_json() if you
want a dplyr::tbl().
Examples
if (FALSE) { # \dontrun{
# Requires a live Azure account, credentials, and network access.
conn <- az_conn()
load_json(conn, "abfss://container@account/data/*.json", name = "events")
} # }