Add debug flag to rule and log condition validation if enabled

Merged mattwire requested to merge mattwire/civirules:ruledebug into master

This adds a is_debug field to the civirule_rule table. It is not (yet) available in the UI.

When enabled it uses the default logger (use civiruleslogger extension) to log if each condition is valid. This allows you to see which condition is true and which is false.

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