F grpc f mixed write transactions

Summary

Mixed-write transactions: caosdb/customers/lfpb/management#425

Focus

• Most changes are in src/main/java/org/caosdb/server/grpc/EntityTransactionServiceImpl.java and generalize the old behavior (single write transactions to multiple and mixed transactions). It was a goal to preserve the order of the entities in the request and response which is a little annoying when string id's are involved which cannot be parsed to integer. This case is handled separately in failedWriteDueToStringId.
• It was necessary to refactor WriteTransaction.deriveUpdate for update transactions where entities are being used which are inserted in the same transaction. See my comment there: !35 (comment 24884)

Test Environment

caosdb-cppinttest!17 (merged)

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src/main/java/org/caosdb/server/entity/wrapper/Property.java

@@ -50,6 +50,7 @@ public class Property extends EntityWrapper {
     super(new Entity());
   }
 
+  /** Return the Property Index, the index of a property with respect to a containing Entity. */
   public int getPIdx() {
     return this.pIdx;
   }
@@ -58,6 +59,7 @@ public class Property extends EntityWrapper {
   private EntityInterface domain = null;
   private boolean isName;
 
+  /** Set the Property Index. */
   public void setPIdx(final int i) {
     this.pIdx = i;
   }