chore: move exporter binary to cmd package (#1768)

Signed-off-by: Jan-Otto Kröpke <mail@jkroepke.de>

internal/windowsservice/doc.go

@@ -0,0 +1,23 @@
+// Copyright 2024 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//go:build windows
+
+// Package windowsservice allows initiating time-sensitive components like registering the Windows service
+// as early as possible in the startup process.
+// init functions are called in the order they are declared, so this package should be imported first.
+// Declare imports on this package should be avoided where possible.
+//
+// Ref: https://github.com/prometheus-community/windows_exporter/issues/551#issuecomment-1220774835
+
+package windowsservice