RPCv0.5 Implementation

[rianhughes]

Full changelog from 0.4 to 0.5 version: starkware-libs/starknet-specs@v0.4.0...v0.5.0

• Reintroduction of Broadcasted Transactions #403
• Addition of new fields to different objects #406
• Addition of new types #407
• Split the transaction receipt object into transaction receipt and pending transaction receipt #409
• Addition of starknet_specVersion method #405
• Update Pending types #423
• Removal of starknet_pendingTransactions method #410
• rpcv05 update declare txn types #420
• Addition of starknet_getTransactionStatus method and TXN_STATUS type #411
• rpcv05 update starknet_traceBlockTransactions #427
• rpcv05 update transaction trace types #431
• rpcv05 update function invocation type #429
• rpcv05 update Block Header and Pending Header  #434
• Update errors #408
• Update starknet_estimateFee params #451 (requires BroadcastedTxn type)
• rpcv05 update write methods #433 (requires Broadcast Txns)

[stranger80]

RPCv0.5 from StarkWare - delayed till Nov

[stranger80]

How long do we need to maintain the 0.4.x compatible code line? We need to deprecate/outdaye the Starknet.go 0.4.x codeline.