refactor(util): COMMANDS_GUILD_ID constant arg order (#440)

* fmt

* refactor(util): change arg order for COMMANDS_GUILD_ID

* refactor(handlers): change arg order for COMMANDS_GUILD_ID

* feat(handlers): add getSlashCommand function

* Update mod.ts

* remove that

src/api/handlers/mod.ts

@@ -116,6 +116,7 @@ import {
   editWebhookMessage,
   executeSlashCommand,
   executeWebhook,
+  getSlashCommand,
   getSlashCommands,
   getWebhook,
   upsertSlashCommand,
@@ -237,6 +238,7 @@ export let handlers = {
   editWebhookMessage,
   deleteWebhookMessage,
   createSlashCommand,
+  getSlashCommand,
   getSlashCommands,
   upsertSlashCommand,
   editSlashCommand,