feat: Add task processing API

[provokateurin]

Not working entirely yet, getting the next task fails with authentication problems.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 47.31183% with 49 lines in your changes missing coverage. Please review.

Project coverage is 94.81%. Comparing base (818dc2e) to head (5dd65f6).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #254 +/- ## ========================================== - Coverage 95.65% 94.81% -0.84% ========================================== Files 46 47 +1 Lines 5312 5403 +91 ========================================== + Hits 5081 5123 +42 - Misses 231 280 +49 ``` | [Files](https://app.codecov.io/gh/cloud-py-api/nc_py_api/pull/254?dropdown=coverage&src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cloud-py-api) | Coverage Δ | | |---|---|---| | [nc\_py\_api/\_session.py](https://app.codecov.io/gh/cloud-py-api/nc_py_api/pull/254?src=pr&el=tree&filepath=nc_py_api%2F_session.py&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cloud-py-api#diff-bmNfcHlfYXBpL19zZXNzaW9uLnB5) | `96.44% <100.00%> (ø)` | | | [nc\_py\_api/ex\_app/providers/providers.py](https://app.codecov.io/gh/cloud-py-api/nc_py_api/pull/254?src=pr&el=tree&filepath=nc_py_api%2Fex_app%2Fproviders%2Fproviders.py&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cloud-py-api#diff-bmNfcHlfYXBpL2V4X2FwcC9wcm92aWRlcnMvcHJvdmlkZXJzLnB5) | `100.00% <100.00%> (ø)` | | | [nc\_py\_api/ex\_app/providers/task\_processing.py](https://app.codecov.io/gh/cloud-py-api/nc_py_api/pull/254?src=pr&el=tree&filepath=nc_py_api%2Fex_app%2Fproviders%2Ftask_processing.py&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cloud-py-api#diff-bmNfcHlfYXBpL2V4X2FwcC9wcm92aWRlcnMvdGFza19wcm9jZXNzaW5nLnB5) | `41.66% <41.66%> (ø)` | |