[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/endpoints/structure.py

@@ -0,0 +1,50 @@
+from django.conf import settings as s
+from ninja import Router
+from ninja_extra.pagination import paginate
+from uuid import UUID
+
+from ..pagination import EnhancedPageNumberPagination
+from ..schemas import CompoundStructureOutSchema, StructureReviewStatusFilter
+from ..dal import (
+    get_user_structures_qs,
+    get_package_compound_scoped_structure_qs,
+)
+
+router = Router()
+
+
+@router.get(
+    "/structures/", response=EnhancedPageNumberPagination.Output[CompoundStructureOutSchema]
+)
+@paginate(
+    EnhancedPageNumberPagination,
+    page_size=s.API_PAGINATION_DEFAULT_PAGE_SIZE,
+    filter_schema=StructureReviewStatusFilter,
+)
+def list_all_structures(request):
+    """
+    List all structures from all packages.
+    """
+    user = request.user
+    return get_user_structures_qs(user).order_by("name").all()
+
+
+@router.get(
+    "/package/{uuid:package_uuid}/compound/{uuid:compound_uuid}/structure/",
+    response=EnhancedPageNumberPagination.Output[CompoundStructureOutSchema],
+)
+@paginate(
+    EnhancedPageNumberPagination,
+    page_size=s.API_PAGINATION_DEFAULT_PAGE_SIZE,
+    filter_schema=StructureReviewStatusFilter,
+)
+def list_package_structures(request, package_uuid: UUID, compound_uuid: UUID):
+    """
+    List all structures for a specific package and compound.
+    """
+    user = request.user
+    return (
+        get_package_compound_scoped_structure_qs(package_uuid, compound_uuid, user)
+        .order_by("name")
+        .all()
+    )