Pinning the version of dotnet-format

Hello all,

Since dotnet-format is now a part of the [SDK](https://github.com/dotnet/format/issues/1268) it potentially poses an issue when upgrading the sdk might potentially change the behaviour of the tool, e.g. new rules are pickled up or introduced.

Is there a way to pin the version of the tool now? It's especially important in case of the CI/CD environment in multi-version product companies where reproducible builds are important (think patch releases for older builds).

Before the tool was moved to the sdk one could pin it in such a way:

Add `.config/dotnet-tools.json` in the root of your repository with the following contents

```json
{
"version": 1,
"isRoot": true,
"tools": {
"dotnet-format": {
"version": "5.1.250801",
"commands": [
"dotnet-format"
]
}
}
}
```

During the CI run something like
```
dotnet tool restore
dotnet tool run dotnet-format $ARGS
```

Is there a way to achieve similar behaviour with the current setup?

Thanks!