Add type of monitor library

[pocke]

This pull request adds RBS files for monitor library.

Note:

• bin/annotate-with-rdoc stdlib/monitor/0/monitor.rbs does nothing.
  • I'm not sure why it doesn't work, but I don't apply RDoc comment to monitor.rbs.
• I wrote test cases only for public APIs.
  • I didn't write tests for private APIs, such as Monitor#mon_locked?. https://github.com/ruby/ruby/blob/53e352fd718cd2cae6d77298e6e92736dddcfeeb/ext/monitor/monitor.c#L214-L220
  • And I also ignored aliases, such as Monitor#mon_enter, so I wrote tests only for the original methods.
• Since Ruby 2.7, Monitor doesn't include MonitorMixin, but it includes MonitorMixin until 2.6.

  • $ docker run -it --rm rubylang/all-ruby env ALL_RUBY_SINCE=ruby-1.8.0 ./all-ruby -rmonitor -e 'p Monitor.ancestors'
    ruby-1.8.0            [Monitor, MonitorMixin, MonitorMixin::Initializable, MonitorMixin::Accessible, Object, Kernel]
    ruby-1.8.1            [Monitor, MonitorMixin, Object, Kernel]
    ...
    ruby-1.8.7-p374       [Monitor, MonitorMixin, Object, Kernel]
    ruby-1.9.0-0          [Monitor, MonitorMixin, Object, Kernel, BasicObject]
    ...
    ruby-2.7.0-preview1   [Monitor, MonitorMixin, Object, Kernel, BasicObject]
    ruby-2.7.0-preview2   [Monitor, Object, Kernel, BasicObject]
    ...
    ruby-2.7.1            [Monitor, Object, Kernel, BasicObject]
    

  • The RBS file follows Ruby 2.7, so it doesn't include MonitorMixin.

[pocke]

• bin/annotate-with-rdoc stdlib/monitor/0/monitor.rbs does nothing.
  • I'm not sure why it doesn't work, but I don't apply RDoc comment to monitor.rbs.

I re-executed bin/annotate-with-rdoc with ruby/ruby@1ca9fac.

0c3bc94

So now we can see the annotated RBS with RDoc.

[soutaro]

👏 💮