Use experimental pydantic, sqlmodel 2 and sqlalchemy 2

JWT based user auth
pydantic_settings conf

src/models/bootstrap.py

@@ -0,0 +1,17 @@
+from sqlmodel import Field, SQLModel, MetaData, JSON, TEXT, Relationship, Column
+from ..config import conf, Map, Measures, Geo
+from .authentication import UserRead
+
+class Proj(SQLModel):
+    srid: str
+    srid_for_proj: str
+
+class BootstrapData(SQLModel):
+    version: str = conf.version
+    title: str = conf.gisaf.title
+    windowTitle: str = conf.gisaf.windowTitle
+    map: Map = conf.map
+    geo: Geo = conf.geo
+    measures: Measures = conf.measures
+    redirect: str = conf.gisaf.redirect
+    user: UserRead | None = None