Add TypeScript definitions to "package.json" for "react-native-tracker" (#1453)

### Issue:

When importing `@snowplow/react-native-tracker`, we got the following error:

```
This result could not be resolved under your current 'moduleResolution' setting. Consider updating to 'node16', 'nodenext', or 'bundler'.
```

Changing the "moduleResolution" to "node16" fixes this issue, but breaks part of our build pipeline.

### Similar issue:

https://github.com/snowplow/snowplow-react-native-tracker/issues/217

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Co-authored-by: Naoufal ElYoussoufi <26110116+nelyousfi@users.noreply.github.com>