feat(server): role based authentication system (#2434)

- Parse toml configuration file, see https://github.com/qdm12/gluetun-wiki/blob/main/setup/advanced/control-server.md#authentication
- Retro-compatible with existing AND documented routes, until after v3.41 release
- Log a warning if an unprotected-by-default route is accessed unprotected
- Authentication methods: none, apikey, basic
- `genkey` command to generate API keys

Co-authored-by: Joe Jose <45399349+joejose97@users.noreply.github.com>

internal/server/middlewares/auth/format.go

@@ -0,0 +1,22 @@
+package auth
+
+func andStrings(strings []string) (result string) {
+	return joinStrings(strings, "and")
+}
+
+func joinStrings(strings []string, lastJoin string) (result string) {
+	if len(strings) == 0 {
+		return ""
+	}
+
+	result = strings[0]
+	for i := 1; i < len(strings); i++ {
+		if i < len(strings)-1 {
+			result += ", " + strings[i]
+		} else {
+			result += " " + lastJoin + " " + strings[i]
+		}
+	}
+
+	return result
+}