feat: pdf backend and table mode as options

[dolfim-ibm]

With this PR we expose the more options in the CLI, i.e. which PDF backend and which table model.

Note: I had to change the enum, because it was serializing to values "1" and "2". Instead of introducing yet another Enum, I think we can be more explicit in the existing one.

Checklist:

• [x] Commit Message Formatting: Commit titles and messages follow guidelines in the conventional commits.
• [x] Documentation has been updated, if necessary.
• [ ] Examples have been added, if necessary.
• [ ] Tests have been added, if necessary.