How to parse list of integers

With argparse, you can do:
```
> python example.py --this 123
> python example.py --this 123 456
> python example.py --this 123 456 789
```
With Fire, how do you parse a list of integers (including a single element list) like argparse?

```
# example.py
import fire

def main(this: list[int]):
print(type(this), this)

if __name__ == '__main__':
fire.Fire(main)
```
```
> python example.py --this 123
123

> python example.py --this 123 456
ERROR: Could not consume arg: 456

> python example.py --this 123 456 789
ERROR: Could not consume arg: 456
```

Start by running the example.py commands from the issue and trace how Python Fire consumes arguments for the annotated main(this: list[int]) entry point. Check the existing argument-parsing tests and compare the single-value and multi-value cases. Done means one or more integer values are accepted for --this and exposed to main as a list.

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