clickhouseGet long query progress updates over HTTP

curl -i "127.0.0.1:8123?send_progress_in_http_headers=1" --data "SELECT * FROM large_table WHERE something = 1"ctrl + cyoutubegithub

`127.0.0.1:8123` Clickhouse HTTP host/port to send query to	`send_progress_in_http_headers` will enable progress headers for this query (will send us `X-ClickHouse-Progress` headers periodically to update query status)
`--data` send query using POST	`SELECT * FROM large_table` assume this query will take long enough to see its progress
`curl -i` curl will show headers while executing request

Usage example

curl -i "127.0.0.1:8123?send_progress_in_http_headers=1" --data "SELECT * FROM large_table WHERE something = 1"

output

HTTP/1.1 200 OK
...
X-ClickHouse-Progress: {"read_rows":"137363115","read_bytes":"549452460","written_rows":"0","written_bytes":"0","total_rows_to_read":"1222011084"}
X-ClickHouse-Progress: {"read_rows":"347774759","read_bytes":"1391099036","written_rows":"0","written_bytes":"0","total_rows_to_read":"1222011084"}
X-ClickHouse-Progress: {"read_rows":"559650718","read_bytes":"2238602872","written_rows":"0","written_bytes":"0","total_rows_to_read":"1222011084"}
X-ClickHouse-Progress: {"read_rows":"734606097","read_bytes":"2938424388","written_rows":"0","written_bytes":"0","total_rows_to_read":"1222011084"}
X-ClickHouse-Summary: {"read_rows":"838824690","read_bytes":"3355298760","written_rows":"0","written_bytes":"0","total_rows_to_read":"1222011084"}

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