quaternary f97443aff6
Use heck for string casing (again) (#10680)
Re-fixes #3674, if that is seen as desirable to do.

# Description
This PR changes the implementation of the `--features=extra` string
casing commands from Inflector to `heck`, as in PR #4081. This PR landed
a long time ago, but somewhere along the way (i can't find it) the
implementation ended up being switched back to Inflector.

# User-Facing Changes
Inflector and `heck` implement casing differently, so all of the
commands have different behavior around edge cases (consecutive
capitals, interspersed numbers and letters, etc)

### Before
```nu
G:/Dev/nu-itself/nushell> [UserID ABCdefGHI foo123bar] | str camel-case
╭───┬───────────╮
│ 0 │ userID    │
│ 1 │ abcdefGHI │
│ 2 │ foo123Bar │
╰───┴───────────╯
G:/Dev/nu-itself/nushell> [UserID ABCdefGHI foo123bar] | str snake-case
╭───┬─────────────╮
│ 0 │ user_id     │
│ 1 │ ab_cdef_ghi │
│ 2 │ foo_12_3bar │
╰───┴─────────────╯
```

### After
```nu
G:/Dev/nu-itself/nushell> [UserID ABCdefGHI foo123bar] | str camel-case
╭───┬───────────╮
│ 0 │ userId    │
│ 1 │ abCdefGhi │
│ 2 │ foo123bar │
╰───┴───────────╯
G:/Dev/nu-itself/nushell> [UserID ABCdefGHI foo123bar] | str snake-case
╭───┬─────────────╮
│ 0 │ user_id     │
│ 1 │ ab_cdef_ghi │
│ 2 │ foo123bar   │
╰───┴─────────────╯
```

# Tests + Formatting

The existing string casing tests pass... because none of them relied on
any of these edge cases
2023-10-13 12:52:35 +02:00
..
2023-10-10 03:31:15 +13:00
2023-10-10 03:31:15 +13:00
2023-10-10 03:31:15 +13:00
2022-02-07 14:54:06 -05:00

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