unified-storage: move rvmanager into its own package (#115445)

* unified-storage: move rvmanager into its own package so it can be reused with sqlkv later

pkg/storage/unified/sql/rvmanager/templates.go

@@ -0,0 +1,30 @@
+package rvmanager
+
+import (
+	"embed"
+	"fmt"
+	"text/template"
+)
+
+// Templates setup.
+var (
+	//go:embed data/*.sql
+	sqlTemplatesFS embed.FS
+
+	sqlTemplates = template.Must(template.New("sql").ParseFS(sqlTemplatesFS, `data/*.sql`))
+)
+
+func mustTemplate(filename string) *template.Template {
+	if t := sqlTemplates.Lookup(filename); t != nil {
+		return t
+	}
+	panic(fmt.Sprintf("template file not found: %s", filename))
+}
+
+var (
+	SqlResourceUpdateRV        = mustTemplate("resource_update_rv.sql")
+	SqlResourceHistoryUpdateRV = mustTemplate("resource_history_update_rv.sql")
+	SqlResourceVersionGet      = mustTemplate("resource_version_get.sql")
+	SqlResourceVersionUpdate   = mustTemplate("resource_version_update.sql")
+	SqlResourceVersionInsert   = mustTemplate("resource_version_insert.sql")
+)