Split off cli into separate binaries (#37)

* 🎨 Split off cli into separate binaries

This commit splits off the cli into 3 binaries:
- agent
- cli
- provider

The provider now is a separate component that can be tested by itself
and have its own lifecycle. This paves the way to a ligher c3os variant,
HA support and other features that can be provided on runtime.

This is working, but still there are low hanging fruit to care about.

Fixes #14

* 🤖 Add provider bin to releases

* ⚙️ Handle signals

* ⚙️ Reduce buildsize footprint

* 🎨 Scan for providers also in /system/providers

* 🤖 Run goreleaser

* 🎨 Refactoring

internal/utils/token.go

@@ -0,0 +1,13 @@
+package utils
+
+import "strings"
+
+const sep = "_CREDENTIALS_"
+
+func EncodeRecoveryToken(data ...string) string {
+	return strings.Join(data, sep)
+}
+
+func DecodeRecoveryToken(recoverytoken string) []string {
+	return strings.Split(recoverytoken, sep)
+}