TimeBucket does not allow for extra arguments allowed by timescaledb

[tales42]

The current implementation of TimeBucket only allows the use of the required arguments (bucket_width and ts).

It would be nice if the remaining arguments could be used as well with the package.
The available argument combinations are as follow:

• time_bucket(bucket_width, ts)
• time_bucket(bucket_width, ts, offset)
• time_bucket(bucket_width, ts, origin)
• time_bucket(bucket_width, ts, timezone, origin, offset)

[tales42]

Opened a PR for it: #44

Did not include support for timezone, because could not find a way to send a named parameter into the db function

[caullla]

what if make all args required? you still will be able to pass None when calling the function