Expose add_jobs to __init__ for use in client

[oliver-gordon]

Description

We need a method of submitting Jobs to a preexisting batch exposed on the interface that's being used by pulser-pasqal. I've also included a required method to mark a batch as complete via the SDK interface.

I've also updated some small nits that weren't quite right. We've got method prefixes for methods that are clearly exported into other files.

Remaining Tasks

Related PRs in other projects (PASQAL developers only)

Additional merge criteria

Breaking changes

Checklist

• [ ] The title of the PR follows the right format: [{Label}] {Short Message}. Label examples: IMPROVEMENT, FIX, REFACTORING... Short message is about what your PR changes.

Versioning (PASQAL developers only)

• [ ] Update the version of pasqal-cloud in _version.py following the changes in your PR and by using semantic versioning.

Documentation

• [ ] Update CHANGELOG.md with a description explaining briefly the changes to the users.

Tests

• [ ] Unit tests have been added or adjusted.
• [ ] Tests were run locally.

Internal tests pipeline (PASQAL developers only)

• [ ] Update and run the internal tests while targeting the branch of this PR. If your PR hasn't changed any functionality, it still needs to be validated against internal tests.

After updating the version (PASQAL developers only)

• [ ] Open a PR on the internal tests that updates the version used for the pasqal-cloud backward compatibility tests.

[oliver-gordon]

I'll update the release version before this MR goes in because there are several MRs that could go in at any point right now and I don't want to push to update multiple times.