Add job to init database & readonly user

[dleard]

We will need a database to house the data and readonly user for metabase to connect to the data warehouse from. The job should do a create database if not exists... and create a user and give that user select permission on all schemas/tables. The user part will likely require a do block and some iterating over schemas. There is no create user if not exists... statement.

AC:

• [x] a job exists that runs on pre-install & pre-upgrade
• [x] the job creates a database if the database doesn't exist
• [x] the job creates a user if the user does not exist
• [ ] the job assigns usage on all schemas in the database and select permissions on all tables in all schemas

[dleard]

Hey team! Please add your planning poker estimate with Zenhub @dleard @mikevespi

[mikevespi]

Permissions handling has been moved to the jobs importing schemas