Create SqlToSlackOperator

[eladkal]

Body

Currently we have SnowflakeToSlackOperator & PrestoToSlackOperator.
This task is to create a generic SqlToSlackOperator to be compatible with all hooks that has get_pandas_df function.
The new operator should be in providers/slack/transfers/sql_to_slack.py, once completed we can also deprecate SnowflakeToSlackOperator & PrestoToSlackOperator.

A good resource for reference can be SqlToS3Operator which the first part of the operator (running query and creating dataframe should be identical), the 2nd part of creating the slack message should be very similar to what the current operators do.

Committer

• I acknowledge that I am a maintainer/committer of the Apache Airflow project.

[alexkruc]

I'm willing to take this one :)
Hopefully, I could manage my way around this issue :)

[potiuk]

assigned you