Add column types to json output

[vvkh]

Add info about column types to --json output. The output includes both raw type (type) and logical type (kind).
No breaking changes to the --json format, only new fields were added.

[sklinov]

@vvkh @dlawin, I suggest we keep the same naming as we have in the Cloud for consistency.
So the native type from the database should be db_type, and the mapped type would be type.