Added metadata resouce-config.json for org.apache.commons:commons-dbcp2:2.12.0

[radovanradic]

What does this PR do?

Adds resource-config.json or else resource locales won't be loaded in GraalVM and an error is thrown:

 java.util.MissingResourceException: Can't find bundle for base name org.apache.commons.dbcp2.LocalStrings, locale en_US

Code sections where the PR accesses files, network, docker or some external service

• (example link to code section)
  Using H2 in memory database for the test.

Checklist before merging

• I have considered including reachability metadata directly in the library or the framework (see our contributing document)
• I am the original author of all content provided in the pull request, and I did not copy the content from any other source (see the tests section from our contributing document)
• For all tests where I am not the sole author, I have added a comment that proves I may publish them under the specified license (see the tests section from our contributing document)
• I have properly formatted metadata files (see our formatting guide)
• I have added thorough tests (see the tests section from our contributing document)
• I have filled all places where my pull request accesses files, network, docker, or any other external service (see the section above)