[#13] Create a manager registry in order to get access to all managers

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (b59e084) 99.84% compared to head (06d43a7) 99.84%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #23 +/- ## ======================================= Coverage 99.84% 99.84% ======================================= Files 26 25 -1 Lines 1311 1313 +2 Branches 216 216 ======================================= + Hits 1309 1311 +2 Misses 1 1 Partials 1 1 ``` | [Impacted Files](https://app.codecov.io/gh/socon-dev/socon/pull/23?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=socon-dev) | Coverage Δ | | |---|---|---| | [socon/core/management/\_\_init\_\_.py](https://app.codecov.io/gh/socon-dev/socon/pull/23?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=socon-dev#diff-c29jb24vY29yZS9tYW5hZ2VtZW50L19faW5pdF9fLnB5) | `100.00% <100.00%> (ø)` | | | [socon/core/management/commands/check.py](https://app.codecov.io/gh/socon-dev/socon/pull/23?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=socon-dev#diff-c29jb24vY29yZS9tYW5hZ2VtZW50L2NvbW1hbmRzL2NoZWNrLnB5) | `100.00% <100.00%> (ø)` | | | [socon/core/manager.py](https://app.codecov.io/gh/socon-dev/socon/pull/23?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=socon-dev#diff-c29jb24vY29yZS9tYW5hZ2VyLnB5) | `100.00% <100.00%> (ø)` | |

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[StephaneCapponi]

@JRbemt, could you check that pull request ?

[JRbemt]

Will check it in the coming days @StephaneCapponi !