Introduce TSDB service (#31520)

* Introduce TSDB service

Signed-off-by: Arve Knudsen <arve.knudsen@gmail.com>

Co-authored-by: Erik Sundell <erik.sundell87@gmail.com>
Co-authored-by: Will Browne <will.browne@grafana.com>
Co-authored-by: Torkel Ödegaard <torkel@grafana.org>
Co-authored-by: Will Browne <wbrowne@users.noreply.github.com>
Co-authored-by: Zoltán Bedi <zoltan.bedi@gmail.com>

pkg/plugins/state.go

@@ -0,0 +1,38 @@
+package plugins
+
+type PluginSignatureStatus string
+
+func (pss PluginSignatureStatus) IsValid() bool {
+	return pss == PluginSignatureValid
+}
+
+func (pss PluginSignatureStatus) IsInternal() bool {
+	return pss == PluginSignatureInternal
+}
+
+const (
+	PluginSignatureInternal PluginSignatureStatus = "internal" // core plugin, no signature
+	PluginSignatureValid    PluginSignatureStatus = "valid"    // signed and accurate MANIFEST
+	PluginSignatureInvalid  PluginSignatureStatus = "invalid"  // invalid signature
+	PluginSignatureModified PluginSignatureStatus = "modified" // valid signature, but content mismatch
+	PluginSignatureUnsigned PluginSignatureStatus = "unsigned" // no MANIFEST file
+)
+
+type PluginState string
+
+const (
+	PluginStateAlpha PluginState = "alpha"
+)
+
+type PluginSignatureType string
+
+const (
+	GrafanaType PluginSignatureType = "grafana"
+	PrivateType PluginSignatureType = "private"
+)
+
+type PluginSignatureState struct {
+	Status     PluginSignatureStatus
+	Type       PluginSignatureType
+	SigningOrg string
+}