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/none.go

@@ -0,0 +1,20 @@
+package auth
+
+import "net/http"
+
+type noneMethod struct{}
+
+func newNoneMethod() *noneMethod {
+	return &noneMethod{}
+}
+
+// equal returns true if another auth checker is equal.
+// This is used to deduplicate checkers for a particular route.
+func (n *noneMethod) equal(other authorizationChecker) bool {
+	_, ok := other.(*noneMethod)
+	return ok
+}
+
+func (n *noneMethod) isAuthorized(_ http.Header, _ *http.Request) bool {
+	return true
+}