Add documentation. Add options to enable/disable the hash providers. Add the option for setup barrier for rotation per requests strategy.

src/main/java/io/kamax/mxisd/config/memory/MemoryStoreConfig.java

@@ -27,6 +27,7 @@ public class MemoryStoreConfig {
 
     private boolean enabled;
     private List<MemoryIdentityConfig> identities = new ArrayList<>();
+    private boolean hashEnabled = false;
 
     public boolean isEnabled() {
         return enabled;
@@ -44,6 +45,14 @@ public class MemoryStoreConfig {
         this.identities = identities;
     }
 
+    public boolean isHashEnabled() {
+        return hashEnabled;
+    }
+
+    public void setHashEnabled(boolean hashEnabled) {
+        this.hashEnabled = hashEnabled;
+    }
+
     public void build() {
         // no-op
     }