External .sql files for creating and configuring target database

[rdagumampan]

When we call yuniql run, it checks if the database exists and pre-created it when --autocreate-db true is passed. It also configures the metadata table where schema versions are tracked and stored. This scripts are embedded in the yuniql build. This makes it difficult to customize if users want a custom behavior when creating databases in DEV or TEST environments.

A solution is to make these scripts as part of init directory. Such that we will have 2 files there 01-create-database.sql and 02-configure-database.sql. Users can also organize it this way.

_init
   - __dev
      - 01-create-database.sql
      - 02-configure-database.sql
   - __tests
      - 01-create-database.sql
      - 02-configure-database.sql