Add module-info.java to JVM artifact

[Oleg Smirnov]

It is required to add the module-info.java file into the JVM artifact in order to correctly work with the Java projects that use Java Platform Module System (JPMS).

module io.github.optimumcode.json {
    requires transitive kotlin.stdlib;
    requires transitive kotlinx.serialization.core;
    requires kotlinx.serialization.json;

    exports io.github.optimumcode.json.pointer;
    exports io.github.optimumcode.json.schema;
}