[Feature] Server pagination implementation (#243)

## Major Changes
- Implement a REST style API app in epapi
- Currently implements a GET method for all entity types in the browse menu (both package level and global)
- Provides paginated results per default with query style filtering for reviewed vs unreviewed.
- Provides new paginated templates with thin wrappers per entity types for easier maintainability
- Implements e2e tests for the API

## Minor changes
- Added more comprehensive gitignore to cover coverage reports and other test/node.js etc. data.
- Add additional CI file for API tests that only gets triggered on API relevant changes.

## ⚠️ Currently only works with session-based authentication. Token based will be added in new PR.

Co-authored-by: Tim Lorsbach <tim@lorsba.ch>
Co-authored-by: jebus <lorsbach@envipath.com>
Reviewed-on: enviPath/enviPy#243
Co-authored-by: Tobias O <tobias.olenyi@envipath.com>
Co-committed-by: Tobias O <tobias.olenyi@envipath.com>

epapi/v1/router.py

@@ -0,0 +1,22 @@
+from ninja import Router
+from ninja.security import SessionAuth
+from .auth import BearerTokenAuth
+from .endpoints import packages, scenarios, compounds, rules, reactions, pathways, models, structure
+
+# Main router with authentication
+router = Router(
+    auth=[
+        SessionAuth(),
+        BearerTokenAuth(),
+    ]
+)
+
+# Include all endpoint routers
+router.add_router("", packages.router)
+router.add_router("", scenarios.router)
+router.add_router("", compounds.router)
+router.add_router("", rules.router)
+router.add_router("", reactions.router)
+router.add_router("", pathways.router)
+router.add_router("", models.router)
+router.add_router("", structure.router)