Add async support to neomodel

[mariusconjeaud]

Introducing support for asynchronous programming to neomodel required to introduce some breaking changes:

• Replace from neomodel import db with from neomodel.sync_.core import db
• config.AUTO_INSTALL_LABELS has been removed. Please use the neomodel_install_labels command instead.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 91.46730% with 214 lines in your changes are missing coverage. Please review.

Project coverage is 82.02%. Comparing base (4bd6302) to head (8bd7aa0).

:exclamation: Current head 8bd7aa0 differs from pull request most recent head ce3a1cf. Consider uploading reports for the commit ce3a1cf to get more accurate results

Files	Patch %	Lines
neomodel/async_/match.py	90.16%	54 Missing :warning:
neomodel/async_/core.py	93.43%	42 Missing :warning:
neomodel/sync_/core.py	93.43%	42 Missing :warning:
neomodel/contrib/async_/semi_structured.py	26.47%	25 Missing :warning:
neomodel/contrib/spatial_properties.py	9.09%	20 Missing :warning:
neomodel/async_/relationship_manager.py	92.01%	19 Missing :warning:
neomodel/sync_/match.py	90.00%	3 Missing :warning:
neomodel/async_/relationship.py	97.59%	2 Missing :warning:
neomodel/scripts/neomodel_install_labels.py	0.00%	2 Missing :warning:
neomodel/scripts/neomodel_remove_labels.py	0.00%	2 Missing :warning:
... and 3 more

Additional details and impacted files

```diff @@ Coverage Diff @@ ## rc/5.3.0 #783 +/- ## ============================================ - Coverage 89.43% 82.02% -7.41% ============================================ Files 22 32 +10 Lines 2669 4429 +1760 ============================================ + Hits 2387 3633 +1246 - Misses 282 796 +514 ```

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[mariusconjeaud]

!!!!!!! The integration tests pipeline was fully successful for the first time since starting the work on async !!!!!!!

It should be ready soon !

[sonarcloud[bot]]

Quality Gate failed

Failed conditions
16.9% Duplication on New Code (required ≤ 3%)

See analysis details on SonarCloud