Support simple hasMatch operation for faster processing

[collinlee]

Wondering if in the Scanner class we could simply have a matches method that returns boolean depending on whether or not there are matches. It would be similar to scan, but not bother building the List of match expressions to return.

[gliwka]

Sounds good, will take this up for the next release!

[mikolajpod]

Adding this method will cover 2 cases.
IMHO better way is to expose
public void scan(Database db, String input, HyperscanLibrary.match_event_handler handler)
method which will handle all use cases by providing custom match handler.