enhance: export command can save to file option

Also update export-edn command to have same default behavior as
export command. Printing to stdout was ok for dev but is surprising and
possibly overwhelming for most graphs

deps/cli/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@logseq/cli",
-  "version": "0.1.0",
+  "version": "0.2.0",
   "description": "Logseq CLI",
   "bin": {
     "logseq": "cli.mjs"