tgravescs opened a new pull request #26083: [SPARK-29417][CORE] Resource 
Scheduling - add TaskContext.resource java api
   ### What changes were proposed in this pull request?
   We added a TaskContext.resources() api, but I realized this is returning a 
scala Map which is not ideal for access from Java.  Here I add a resourcesJMap 
function which returns a java.util.Map to make it easily accessible from Java.
   ### Why are the changes needed?
   Java API access
   ### Does this PR introduce any user-facing change?
   If yes, please clarify the previous behavior and the change this PR proposes 
- provide the console output, description and/or an example to show the 
behavior difference if possible.
   If no, write 'No'.
   Yes, new TaskContext function to access from Java
   ### How was this patch tested?
   If tests were added, say they were added here. Please make sure to add some 
test cases that check the changes thoroughly including negative and positive 
cases if possible.
   If it was tested in a way different from regular unit tests, please clarify 
how you tested step by step, ideally copy and paste-able, so that other 
reviewers can test and check, and descendants can verify in the future.
   If tests were not added, please describe why they were not added and/or why 
it was difficult to add.
   new unit test

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