Add boolean and Timestamp to min max

[griffio]

closes #4174

The error is caused as Boolean is not a specified return type in the dialect functions.

The min and max functions currently only return Numeric and Character types.

Extend this for Boolean and Timestamps as well

Sqlite and MySql don't have a native boolean type

Postgres has a boolean type and doesn't allow '1' or '0' to be treated as boolean

Note: As min and max are nullable return types, will be a custom result rather than a primitive

Todo - mysql
consider #4211
#4243

[hfhbd]

Note: As min and max are nullable return types, will be a custom result rather than a primitive

Yes, this is the current design, or do I miss something?

[hfhbd]

Thank you.