Postgres layer option

To deploy Autosubmit in EDITO, we will need to have the option to save to a different DBMS like Postgres.

• This option could be available inside the .autosubmitrc file and it will persist the DDBB data inside the Postgres instance we will have in EDITO.
• As a scope, we aim to implement a middle layer to decide which engine to use (SQLite/Postgres) keeping the same table schemas for now.
• Update the AS code
  • autosubmit.database package, already done by @ltenorio !)
  • autosubmit.history 😱, @bdepaula will take a look if we can remove things first
  • Tests!
    • @ltenorio will check out pytest + unittest (use pytest to run existing tests) and add a conftest.py
    • Create a fixtures to overwrite the BasicConfig and prepare the DDBB for testing
    • Create temporary sqlite for each tests as needed
    • Create a Docker postgres DB for each tests as needed
    • Run sqlite tests on GitLab worker, Docker+pg locally

Tests that need to be performed (@ltenorio feel free to add more to this list):

• Install AS from scratch
• Create a workflow
• Run a dummy experiment
• Set status
• Use wrappers
• Archive a workflow (what's going to happen here?
• Delete experiments https://earth.bsc.es/gitlab/es/autosubmit/-/issues/1317#note_284520

@mcastril @bdepaula @dbeltran