[feature] Port performance comparison workflow from Casbin (Go) to jCasbin

[knyk-dev]

Please implement the automatic performance benchmark comparison feature for jCasbin, mirroring the mechanism used in the Go version.

Reference Implementation (Go):

• Original PR: feat: add performance comparison CI for pull requests casbin#1613
• Workflow File: .github/workflows/performance-pr.yml

Target Context (Java):

• Benchmark Class: src/test/java/org/casbin/jcasbin/main/benchmark/EnforcerBenchmarkTest.java
• Build Tool: Maven

Requirement:
Create a GitHub Action workflow (.github/workflows/performance-pr.yml) that runs the JMH benchmarks on both the base and head commits of a PR, calculates the performance difference (throughput), and posts the result as a comment on the PR.