AB#2490: deploy KMS via Helm

* Bundle helm-install related code in speparate package
* Move cilium installation to new helm package

bootstrapper/internal/helm/kms.go

@@ -0,0 +1,13 @@
+/*
+Copyright (c) Edgeless Systems GmbH
+
+SPDX-License-Identifier: AGPL-3.0-only
+*/
+
+package helm
+
+// KMSConfig is the configuration needed to set up Constellation's key management service.
+type KMSConfig struct {
+	MasterSecret []byte
+	Salt         []byte
+}