Henrik Hørlück Berg 20be990fd9 Port builtins/string to Rust
- Add test to verify piped string replace exit code

Ensure fields parsing error messages are the same.

Note: C++ relied upon the value of the parsed value even when `errno` was set,
that is defined behaviour we should not rely on, and cannot easilt be replicated from Rust.
Therefore the Rust version will change the following error behaviour from:

```shell
> string split --fields=a "" abc
string split: Invalid fields value 'a'
> string split --fields=1a "" abc
string split: 1a: invalid integer
```

To:

```shell
> string split --fields=a "" abc
string split: a: invalid integer
> string split --fields=1a "" abc
string split: 1a: invalid integer
```
2023-07-27 22:00:03 -07:00
..
2023-07-27 22:00:03 -07:00
2021-08-30 17:16:19 +02:00