Loïc Riegel 220858d641
history table using sqlite outputs start_timestamp as datetime instead of string (#15630)
Closes #13581

# Description
Before, the table you got from ``history`` had values as strings in the
``startup_timestamp`` column.
Now the values are datetimes.

# User-Facing Changes
```nushell
~\workspace_tns\nushell> history | last 5
╭───┬─────────────────┬─────────────────────┬───────────────────────────────────────────┬─────╮
│ # │ start_timestamp │       command       │                    cwd                    │ ... │
├───┼─────────────────┼─────────────────────┼───────────────────────────────────────────┼─────┤
│ 0 │ a minute ago    │ history             │ C:\Users\RIL1RT\workspace_tns\nushell-bis │ ... │
│ 1 │ 40 seconds ago  │ cd nushell          │ C:\Users\RIL1RT\workspace_tns\nushell-bis │ ... │
│ 2 │ 31 seconds ago  │ target\debug\nu.exe │ C:\Users\RIL1RT\workspace_tns\nushell     │ ... │
│ 3 │ 26 seconds ago  │ history             │ C:\Users\RIL1RT\workspace_tns\nushell     │ ... │
│ 4 │ now             │ history | last 5    │ C:\Users\RIL1RT\workspace_tns\nushell     │ ... │
╰───┴─────────────────┴─────────────────────┴───────────────────────────────────────────┴─────╯
```

# Tests + Formatting


# After Submitting
2025-04-24 08:33:13 -05:00
..
2025-01-28 16:03:31 -06:00