[manoelcampos]

Adds CloudletSimple to the memory benchmark, to measure the memory saved by cloudsimplus/cloudsimplus#587 (merged in cloudsimplus/cloudsimplus#594).
Related to cloudsimplus/cloudsimplus#523.

Changes

• The benchmark also measures the heap retained by each CloudletSimple (created with the default utilization models).
• ListenersMemoryBenchmark was renamed to org.cloudsimplus.benchmarks.MemoryFootprintBenchmark, since it measures the whole memory footprint of each object (with everything it references), not only the listeners. This way, it covers all changes from #587.
• Javadoc and CLAUDE.md describe the changes from #586 and #587.

Results

./mvnw clean package -Pcloudsimplus-8
java -XX:+UseSerialGC -cp target/cloudsimplus-benchmarks-*-uber.jar org.cloudsimplus.benchmarks.MemoryFootprintBenchmark 8.5.1

./mvnw clean package
java -XX:+UseSerialGC -cp target/cloudsimplus-benchmarks-*-uber.jar org.cloudsimplus.benchmarks.MemoryFootprintBenchmark current

Class	8.5.1	Current (9.0.0-SNAPSHOT, with #594)	Difference
VmSimple	1144 B	880 B	−264 B
HostSimple	880 B	912 B	+32 B
CloudletSimple	464 B	216 B	−248 B (−53.4%)

The Cloudlet savings match the estimate from #594 exactly (the benchmark gives the total; the split below comes from #594):

• 3 listener HashSets replaced by the shared List.of(): ~192 B;
• requiredFiles created only on the first added file: ~32 B;
• shared UtilizationModel.FULL instead of a new UtilizationModelFull per Cloudlet: ~24 B.

That is about 248 MB less heap per 1M Cloudlets.

The comparison with 8.5.1 includes all changes since that version, not only #587 (see #7 for the VM and Host results).

Run with JDK 25.0.4 (Corretto), compressed oops, with CloudSim Plus master (9bb9de25c) installed locally.

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