Add ability to configure refresh period and max size of loading caches

core/src/main/java/org/eclipsefoundation/core/config/LoadingCacheConfig.java

@@ -11,6 +11,7 @@
  */
 package org.eclipsefoundation.core.config;
 
+import java.time.Duration;
 import java.util.Map;
 import java.util.Optional;
 
@@ -63,5 +64,17 @@ public interface LoadingCacheConfig {
          */
         @WithDefault("5")
         Long timeout();
+
+        /**
+         * @return the duration a given cache element should exist before recalculation
+         */
+        @WithDefault("PT1H")
+        Duration refreshAfter();
+
+        /**
+         * @return the number of keys that should be maintained in the cache
+         */
+        @WithDefault("10")
+        int maximumSize();
     }
 }