refactor(odin): ported backup command.

cmd_backup.odin

@@ -0,0 +1,34 @@
+package main
+
+import "core:fmt"
+import "core:strings"
+
+cmd_backup :: proc(cmd: ^Command) {
+	if len(cmd.args) != 1 {
+		fmt.println("Usage: envr backup <path>")
+		return
+	}
+
+	path := cmd.args[0]
+	if len(strings.trim_space(path)) == 0 {
+		fmt.println("Error: No path provided")
+		return
+	}
+
+	file, ok := new_env_file(path)
+	if !ok {
+		return
+	}
+
+	db, db_ok := db_open()
+	if !db_ok {
+		return
+	}
+	defer db_close(&db)
+
+	if !db_insert(&db, file) {
+		return
+	}
+
+	fmt.printf("Saved %s into the database\n", path)
+}