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
- move log middleware to internal/server/middlewares/log

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

internal/server/middlewares/auth/interfaces_local.go

@@ -0,0 +1,8 @@
+package auth
+
+import "net/http"
+
+type authorizationChecker interface {
+	equal(other authorizationChecker) bool
+	isAuthorized(headers http.Header, request *http.Request) bool
+}