Consider changing `--version` to be more specific

```
$ extism --version
extism version 1.0.0
```

I understand why it says this because the program itself is called `extism` but it might make more sense to override this and change it to something like `extism-cli version 1.0.0`. Because it could be confused that this is the lib version but they are in fact different things.

```
$  extism lib check
1.0.0
```