[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>

static/css/input.css

@@ -36,24 +36,17 @@
 @import "./daisyui-theme.css";
 
 /* Loading Spinner - Benzene Ring */
-.loading-spinner {
+.benzene-spinner {
   display: flex;
   justify-content: center;
   align-items: center;
   padding: 2rem;
 }
 
-.loading-spinner svg {
+.benzene-spinner svg {
   width: 48px;
   height: 48px;
-  animation: spin 2s linear infinite;
-}
-
-.loading-spinner .hexagon,
-.loading-spinner .double-bonds {
-  fill: none;
-  stroke: currentColor;
-  stroke-width: 2;
+  animation: spin 3s linear infinite;
 }
 
 @keyframes spin {