HIP-551: Batch transactions

[netopyr]

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1. Finalize specification for HIP-551 (batch transactions) #15612
   Batch Transactions HiP-551 +2
   
2. Specify test plan for HIP-551 (batch transactions) #15613
   Batch Transactions HiP-551 +2
   
3. Implement HIP-551 protobuf changes #17318
   Batch Transactions HiP-551 +2
   
4. Create the feature flag #17319
   Batch Transactions HiP-551 +2
   
5. Implement the AtomicBatchTransactionHandler structure #17320
   Batch Transactions HiP-551 +2
   
6. Implement preHandle() and pureChecks() methods #17358
   Batch Transactions HiP-551 +2
   
7. Implement the handle() method #17370
   Batch Transactions HiP-551 +2
   
8. update dispatch to enable charging fees on earlier tx when a later tx is rolled back #17349
   Batch Transactions HiP-551 +2
   
9. Implement the calculateFees() method #17373
   Batch Transactions HiP-551 +2
   
10. Set the throttle configuration #17374
    Batch Transactions HiP-551 +2
    
11. Implement the HAPI verbs #17375
    Batch Transactions HiP-551 +2
    
12. Implement the edge HAPI test cases #17376
    Batch Transactions HiP-551 +2
13. Sync the proto changes with the proto repository #17377
    Batch Transactions HiP-551 +2