Merge #2967

2967: Set deprecation warning on query command r=bronzdoc a=bronzdoc

# Description:
We have been discouraging user for the use of the query command for a long time.
```
Summary:
    Query gem information in local or remote repositories

  Description:
    The query command is the basis for the list and search commands.

    You should really use the list and search commands instead.  This command
    is too hard to use.
```

 It's time to deprecate it.

This will setup a deprecation warning whenever is used.

______________
I will abide by the [code of conduct](https://github.com/rubygems/rubygems/blob/master/CODE_OF_CONDUCT.md).


Co-authored-by: bronzdoc <lsagastume1990@gmail.com>

lib/rubygems/commands/query_command.rb

@@ -4,9 +4,13 @@
 require 'rubygems/spec_fetcher'
 require 'rubygems/version_option'
 require 'rubygems/text'
+require 'rubygems/deprecate'
 
 class Gem::Commands::QueryCommand < Gem::Command
 
+  extend Gem::Deprecate
+  deprecate_command(2019, 12)
+
   include Gem::Text
   include Gem::LocalRemoteOptions
   include Gem::VersionOption

test/rubygems/test_gem_commands_query_command.rb

@@ -844,6 +844,10 @@ def test_execute_exact_multiple
     assert_equal expected, @stub_ui.output
   end
 
+  def test_depprecated
+    assert @cmd.deprecated?
+  end
+
   private
 
   def add_gems_to_fetcher