rpcdaemon: add config flag to toggle response dump in interface log #1959
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This PR introduces a configuration flag in RPC interface log to enable/disable the dump of any response (disabled by default).
Dumping the whole response can be useful for debugging some specific request/response pair, but makes the interface log content grow very fast, so it should be enabled carefully.
Command-line options to enable/disable the feature in each ETH/Engine endpoint are also added.