support (boolean) type-casting in factory_settings

[kares]

e.g. when a JMS factory setter accepts a boolean (int, long should work but could use a test) value the plugin will fail to start:

input {
    jms {
        broker_url => '(tcp://activemq:61616)/?initialReconnectDelay=100' 
        destination => 'myqueue' 
        factory => 'org.apache.activemq.ActiveMQConnectionFactory' 
        username => 'admin'
        password => 'password'

        # Message selector
        selector => "string_property = 'this' OR int_property < 3" 
        
        # Connection factory specific settings
        factory_settings => { 
                              exclusive_consumer => true
        }

        require_jars => ['./apache-activemq-5.16.0/activemq-all-5.16.0.jar'] 
    }
  }

this will attempt to do a factory.setExclusiveConsumer but will fail due the parameter being "true" instead of true.

[2020-10-27T09:34:41,458][WARN ][logstash.inputs.jms      ][main]
JMS Consumer Died {:exception=>"TypeError", :exception_message=>"cannot convert instance of class org.jruby.RubyString to boolean", :backtrace=>[
"/usr/share/logstash/vendor/bundle/jruby/2.5.0/gems/jruby-jms-1.3.0-java/lib/jms/connection.rb:193:in `block in initialize'", 
"org/jruby/RubyHash.java:1415:in `each'", "/usr/share/logstash/vendor/bundle/jruby/2.5.0/gems/jruby-jms-1.3.0-java/lib/jms/connection.rb:188:in `initialize'", "/usr/share/logstash/vendor/bundle/jruby/2.5.0/gems/logstash-input-jms-3.1.2-java/lib/logstash/inputs/jms.rb:225:in `run'", "/usr/share/logstash/logstash-core/lib/logstash/java_pipeline.rb:405:in `inputworker'", "/usr/share/logstash/logstash-core/lib/logstash/java_pipeline.rb:396:in `block in start_input'"]} ...

... relevant jruby-jms line simply does a send, this should be considered when migrating from using the gem #50

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The issue originates from a LS bug report: elastic/logstash#12343