Able to pretty print sql query result in http output

[MichaelScofield]

What type of enhancement is this?

API improvement

What does the enhancement do?

Currently the sql query result in http api is printed as json, which is not good for us human to view the table data directly. For example,https://docs.greptime.com/user-guide/protocols/http#post-sql-statements . If we could provide an option to pretty print the sql query result in table format, like mysql clients do, it would be very helpful for maintainer in offline/restricted/limited environment to debug and test our db. So I suggest adding a parameter "format=table" in http api along with "sql=xxx" to this end.

Implementation challenges

No response

[tisonkun]

Related to #577.

We'd better design a format aware API first instead of adding parameter casually.

[tisonkun]

Also ref to ClickHouse's Pretty format - https://clickhouse.com/docs/en/interfaces/formats#pretty