feat: Rate Limiting Pattern #2973 (#3291)

* need to fix one test case shouldGraduallyIncreaseLimitWhenHealthy failing for AdaptiveRateLimiter.java

* Added Class Diagram and Flow Diagrams for Adaptive, Fixed Window and Token Bucket Rate Limiter

* Updated README.md. All test case passed. Updated with Google Java Guidelines

* Updated parent pom #2973

* Updated parent pom #2973

* fixed shouldResetCounterAfterWindow() test #2973

* formatting fixed #2973

* added test coverage for app.java and fixed random to be thread safe #2973

* added test coverage for app.java and fixed random to be thread safe #2973

* added test coverage for app.java and fixed random to be thread safe #2973

* added test coverage for app.java and fixed random to be thread safe #2973

* added test coverage for app.java and fixed random to be thread safe #2973

* added test coverage for app.java and fixed random to be thread safe #2973

* added test coverage for app.java and fixed random to be thread safe #2973

* fixed random to be thread safe #2973

* fixed random to be thread safe #2973

* fixed random to be thread safe #2973

* fixed spacing in pom.xml #2973

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Co-authored-by: Ilkka Seppälä <iluwatar@users.noreply.github.com>