Move all commands to their own files

Cargo.lock

@@ -2316,8 +2316,6 @@ dependencies = [
  "num-integer",
  "poise",
  "postman",
- "proc-macro2",
- "quote",
  "rand",
  "regex",
  "reminder_web",
@@ -2328,7 +2326,6 @@ dependencies = [
  "serde_json",
  "serde_repr",
  "sqlx",
- "syn 2.0.49",
  "tokio",
 ]