Add support for Java UDFs on the module path

[kaklakariada]

Currently it is not possible to add JARs to the module path.

Executing the following UDF with a modularized JAR fails with error message F-UDF-CL-SL-JAVA-1042: FindClass for com.exasol.ExaUndefinedSingleCallException failed.

CREATE JAVA SCALAR SCRIPT JAVA_MODULE_TEST() RETURNS INT AS
%scriptclass com.exasol.slc.testudf.Main;
%jvmoption --module-path={java_udf_jar_bucketfs_path}:/buckets/default/udf-api-java-1.0.5.jar;
%jvmoption --add-exports=java.base/sun.security.x509=ALL-UNNAMED;
%jvmoption --add-modules=ALL-MODULE-PATH;

Adding /exaudf/javacontainer/libexaudf.jar additionally to the module path results in this error:

java.lang.module.ResolutionException: Module udf.api.java contains package com.exasol, module libexaudf exports package com.exasol to udf.api.java

To solve this, we need to extract the UDF API from libexaudf.jar and let libexaudf.jar depend on udf-api-java-1.0.5.jar.

[redcatbear]

Since no customer required that, we will close this ticket for now. We can reopen it once we get an explicit request.