[ruby-core:116906] [Ruby master Feature#20291] Add --warning=category option the same as -W:category

Issue #20291 has been reported by nobu (Nobuyoshi Nakada). ---------------------------------------- Feature #20291: Add --warning=category option the same as -W:category https://bugs.ruby-lang.org/issues/20291 * Author: nobu (Nobuyoshi Nakada) * Status: Open ---------------------------------------- I propose a `--warning` option that corresponds to the `-W` option, like the `--encoding` option to the `-E` option. The argument after `--warning=` is same as `-W:`. https://github.com/ruby/ruby/pull/4113 -- https://bugs.ruby-lang.org/