refine connection string parsing

[anwarfg]

Is this the right issue type?

• Yes, I'm planning work for this project team.

Summary

Remove connection string parsing. Rely on env vars/injection.

Swap the current variable parsing to use SQLalchemy entirely - we can avoid using the urlparser lib.

Acceptance Criteria

• Connection string parsing is removed.
• Environment variable parsing uses SQL alchemy.
• Tests pass.
• Documentation added.

Tasks

• Task A.
• Task B.
• Unit tests.
• Documentation.

Confirm creation

• Ready to create this deliverable?