Add support for java modules related keywords.

[anton-balaniuc]

A module system was added to Java-9 with a number of a new keywords.
However prism.js doesn't recognize this keywords and as result they are
not highlighted. Please find below some of the possible combinations:

module com.js.prism {
    exports java.net.http;
    exports jdk.internal.editor.spi to jdk.jshell;

    requires java.base;
    requires transitive java.xml;

    uses java.net.ContentHandlerFactory;

    opens java.time.DateTime;
    opens java.time.LocalDateTime to java.logging;

    provides com.modules.hello.HelloInterface with com.modules.hello.HelloModules;

}

[RunDevelopment]

Thank you for your contribution!

There are a few things we will have to change before we can merge this. Apart from the comments I left, please update the keyword test.
Also, It'd be great if you could make the example you provided a test. Something like module_feature.test.

[anton-balaniuc]

I have fixed the incorrect order of keywords (sorted alphabetically now) and namespace pattern contains a shorter regex now. As well the keywords test for java has been updated and new module test has been added.