♻️ Use of pydantic to manage config+env variables

FastAPI release has been updated allowing to use lifespan parameter
to prepare/shutdown sub components.

backend/pyproject.toml

@@ -11,7 +11,7 @@ python = "^3.11"
 aiohttp = "^3.8.3"
 rich = "^12.6.0"
 aiofiles = "^22.1.0"
-fastapi = "^0.88.0"
+fastapi = "^0.95.0"
 uvicorn = "^0.20.0"
 msgspec = "^0.12.0"
 pyshp = "^2.3.1"
@@ -25,6 +25,7 @@ opentelemetry-exporter-otlp-proto-http = "^1.17.0"
 opentelemetry-instrumentation-sqlalchemy = "^0.38b0"
 sqlalchemy = "^2.0.12"
 psycopg = "^3.1.9"
+pyyaml = "^6.0"
 
 [build-system]
 requires = ["poetry-core"]
@@ -48,6 +49,7 @@ yapf = "^0.32.0"
 whatthepatch = "^1.0.4"
 mypy = "^1.0.0"
 types-sqlalchemy-utils = "^1.0.1"
+types-pyyaml = "^6.0.12.9"
 
 [tool.mypy]
 plugins = "sqlalchemy.ext.mypy.plugin"