Merge branch 'add-loginEmail-policy' into 'main'

Add login email policy

See merge request gaia-x/data-infrastructure-federation-services/tsa/policies!8

example/loginEmail/1.0/data.json

+{
+  "trustedEmails": [
+    "example@example.com",
+    "test@example.com",
+    "policy@example.com"
+  ]
+}

example/loginEmail/1.0/policy.rego

+package example.loginEmail
+
+import future.keywords.in
+
+default allow = false
+
+allow {
+    input.email in data.trustedEmails
+}