Clickhouse times always truncated to seconds

In anything marked as a `type: time`, the following code causes Clickhouse `DateTime64()` columns to be truncated to per-second:

https://github.com/cube-js/cube/blob/1cf867ac752d940c32fc1b5c69f005183db6ac74/packages/cubejs-schema-compiler/src/adapter/ClickHouseQuery.ts#L42-L51

In our case we are wanting to pull logs from the server (with `ungrouped: true`) and get them ordered according to millisecond/microsecond timestamps which are in the database.

In order to work around this issue I've had to resort to the following hack:

```
- name: created
sql: created
type: time
primary_key: true

- name: timestamp
description: The unix epoch timestamp of the message
sql: "toFloat64({CUBE}.created)"
type: number
```