Use Flow Emulator for local development

[m-Peter]

To ease local development for the EVM Gateway, we have to use the Emulator as the backend.

To support that:

• Emulator needs to provide the Event Streaming API over gRPC ✅ (Enable state streaming API over gRPC flow-emulator#547)
• A new EVM TypeID for the emitted events is needed [approved] ([EVM] Add EVM type ID flow-go#5091)
• Event validation logic should be updated to handle the new TypeID [in review] (Update event validation logic to account for the evm.* events flow-go#5262)
• The EVM Gateway should start the indexer and connect to a locally running Emulator process, and subscribe to the appropriate event types (evm.BlockExecuted / evm.TransactionExecuted )