Add support to inserting messages as facts in drools-camel

Add support to inserting messages as facts into a drools session, in drools camel.

It should be possible to define routes that insert message bodies as facts. E.g.:

to( "drools:node/session?action=insertBody" );

In should be possible to define routes that insert messages themselves as facts. E.g.:

to( "drools:node/session?action=insertMessage" );

In should be possible to define routes that insert the Exchange object as facts. E.g.:

to( "drools:node/session?action=insertExchange" );

Also, for all cases above, it should be possible to define a specific entry-point in drools where such facts will be inserted:

to( "drools:node/session?action=insertBody&entryPoint=ep1" );