* Add Caffeine-based loadBalancerCacheManager.
* Add more tests.
* Fix test.
* Only enable loadBalancer caching if caffeine is on classpath. Warn if
caffeine is not on classpath.
* Add javadocs.
* Add docs. Change property name.
* Fix configuration.
* Fix after code review. Add another constructor to CaffeineBasedLoadBalancerCacheManager,
allowing to pass cache name, in order to support alternative ServiceInstanceListSupplierImplementations.
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