Add -truncated option to `rndc dumpdb`

Diego dos Santos Fronza requested to merge 796-dumpdb-truncated into main

When running rndc dumpdb the resulting dump file might be too large, therefore, an option to truncate each RR whose RData exceeds 192 bytes is added. The total amount of bytes that have been truncated from the output is displayed at the end of the dump.

Closes #796 (closed)

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