add sink_protojson and sink_parquet #727
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examples:
substreams sink json substreams_ethereum_usdt@v0.1.0 map_events -o ./output --filter=.transfers[] -n 100 -s 20000000 -t +200substreams sink parquet substreams_ethereum_usdt@v0.1.0 map_events -o ./output_parquet --start-block=20000000 --stop-block=+200 --blocks-per-file=100(then
echo "SELECT * FROM read_parquet('./output_parquet/transfers') LIMIT 5" | duckdb)