Affiche le nb de congés payés restants

[florimondmanca]

• Closes #381
• Closes #384

TODO

• [x] Permettre de choisir de qui on affiche le solde (soi par défaut)
• [x] Quelques tests

Aperçu

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 91.42857% with 3 lines in your changes missing coverage. Please review.

Project coverage is 90.37%. Comparing base (42b3d96) to head (2687722).

Files	Patch %	Lines
.../HumanResource/Leave/Repository/LeaveRepository.ts	25.00%	3 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #442 +/- ## ========================================== + Coverage 90.35% 90.37% +0.01% ========================================== Files 189 191 +2 Lines 2219 2254 +35 Branches 159 165 +6 ========================================== + Hits 2005 2037 +32 - Misses 205 217 +12 + Partials 9 0 -9 ```

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[florimondmanca]

Merci pour la review @fuuuzz