Support large nonces in the processor

[dzhelezov]

Problem
The nonce field may be too large, breaking the processor ingester
RPC endpoint: https://toy-chain-testnet.rpc.caldera.xyz/http
Full response:
DataValidationError: server returned unexpected result: invalid value at /0/result/pre/0x00000000000000000000000000000000000a4b05/nonce: 18446744073709552000 is not a safe natural number