[Java] Fix POM (#1106)

As reported in #1090, we are producing a "broken" "jar with dependecies" today: the Jar contains extra files that make it impossible to consume from a modularized application, as it breaks the module definition.

This PR fixes this by:
- removing `spotless` as a dependency: adding it as a dependency is not needed, as spotless is used at build time
- ~~removing the `jar-with-dependency` build task: we don't need it, as we don't have dependencies today. If we have in the future, we can re-introduce it, with a better handling of the merge process~~
- change the build script to install in the local maven repository the "regular" jar produced by the build process

EDIT: after review, we decided to revert the removal of the task creating  `jar-with-dependency`, as we might need it in the future (will need fixing anyway, but we can defer that until we need it).

Closes #1090

Authors:
  - Lorenzo Dematté (https://github.com/ldematte)
  - Ben Frederickson (https://github.com/benfred)
  - MithunR (https://github.com/mythrocks)

Approvers:
  - MithunR (https://github.com/mythrocks)
  - Bradley Dice (https://github.com/bdice)

URL: #1106

Author: ldematte

java/build.sh

@@ -40,5 +40,5 @@ fi
 export LD_LIBRARY_PATH=${CURDIR}/../cpp/build:${LD_LIBRARY_PATH}
 cd cuvs-java
 mvn verify "${MAVEN_VERIFY_ARGS[@]}" \
-  && mvn install:install-file -Dfile=./target/cuvs-java-$VERSION-jar-with-dependencies.jar -DgroupId=$GROUP_ID -DartifactId=cuvs-java -Dversion=$VERSION -Dpackaging=jar \
+  && mvn install:install-file -Dfile=./target/cuvs-java-$VERSION.jar -DgroupId=$GROUP_ID -DartifactId=cuvs-java -Dversion=$VERSION -Dpackaging=jar \
   && cp pom.xml ./target/

java/cuvs-java/pom.xml

@@ -101,13 +101,6 @@
             <version>4.13.1</version>
             <scope>test</scope>
         </dependency>
-
-        <dependency>
-            <groupId>com.diffplug.spotless</groupId>
-            <artifactId>spotless-maven-plugin</artifactId>
-            <version>2.44.5</version>
-        </dependency>
-
     </dependencies>
 
     <build>