Don't unnecessarily marshal RPC arguments for logging #1733
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The current code always marshalled all RPC calls as JSON for logging, even if it would only be logged to trace and trace logging wasn't enabled. This PR replaces that functionality with a lazy struct that only marshals when stringified by the logger, which only happens if the log is actually printed.
I also changed the code to keep the limit on RPC log line length even if there's an error, because the validation RPC logs can be crazy long.