[Feature] Implement Search modal in Modern UI (#185)

Implementing a search modal (stretching the level of dynamic that is possible without going to frameworks).

## Major Change
- Search needs packages and is available everywhere now; so had to add reviewed and user packages to global context.

Co-authored-by: Tim Lorsbach <tim@lorsba.ch>
Reviewed-on: enviPath/enviPy#185
Co-authored-by: Tobias O <tobias.olenyi@envipath.com>
Co-committed-by: Tobias O <tobias.olenyi@envipath.com>

epdb/context_processors.py

@@ -0,0 +1,32 @@
+"""
+Context processors for enviPy application.
+
+Context processors automatically make variables available to all templates.
+"""
+
+from .logic import PackageManager
+from .models import Package
+
+
+def package_context(request):
+    """
+    Provides package data for the search modal which is included globally
+    in framework_modern.html.
+
+    Returns:
+        dict: Context dictionary with reviewed and unreviewed packages
+    """
+    current_user = request.user
+
+    reviewed_package_qs = PackageManager.get_reviewed_packages()
+
+    unreviewed_package_qs = Package.objects.none()
+
+    # Only get user-specific packages if user is authenticated
+    if current_user.is_authenticated:
+        unreviewed_package_qs = PackageManager.get_all_readable_packages(current_user)
+
+    return {
+        "reviewed_packages": reviewed_package_qs,
+        "unreviewed_packages": unreviewed_package_qs,
+    }