WindSoilder 14bf25da14 rename from date format to format date (#9902) ...

# Description
Closes: #9891
I also think it's good to keep command name consistency.

And moving `date format` to deprecated.

# User-Facing Changes
Running `date format` will lead to deprecate message:
```nushell
❯ "2021-10-22 20:00:12 +01:00" | date format
Error: nu:🐚:deprecated_command

  × Deprecated command date format
   ╭─[entry #28:1:1]
 1 │ "2021-10-22 20:00:12 +01:00" | date format
   ·                                ─────┬─────
   ·                                     ╰── 'date format' is deprecated. Please use 'format date' instead.
   ╰────
```

2023-08-04 06:06:00 +12:00

..

format.rs

rename from date format to format date (#9902)

2023-08-04 06:06:00 +12:00

mod.rs

fix date format (#5619)

2022-05-23 09:59:34 -07:00