[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>

envipath/settings.py

@@ -48,6 +48,7 @@ INSTALLED_APPS = [
     "django_extensions",
     "oauth2_provider",
     # Custom
+    "epapi",  # API endpoints (v1, etc.)
     "epdb",
     # "migration",
 ]
@@ -198,6 +199,12 @@ if not os.path.exists(LOG_DIR):
     os.mkdir(LOG_DIR)
 
 PLUGIN_DIR = os.path.join(EP_DATA_DIR, "plugins")
+
+API_PAGINATION_DEFAULT_PAGE_SIZE = int(os.environ.get("API_PAGINATION_DEFAULT_PAGE_SIZE", 50))
+PAGINATION_MAX_PER_PAGE_SIZE = int(
+    os.environ.get("API_PAGINATION_MAX_PAGE_SIZE", 100)
+)  # Ninja override
+
 if not os.path.exists(PLUGIN_DIR):
     os.mkdir(PLUGIN_DIR)
 
@@ -355,6 +362,7 @@ FLAGS = {
 # -> /password_reset/done is covered as well
 LOGIN_EXEMPT_URLS = [
     "/register",
+    "/api/v1/",  # Let API handle its own authentication
     "/api/legacy/",
     "/o/token/",
     "/o/userinfo/",