Export tsconfigs

We should export a number of standard configs that can be used in the `extends` option of a tsconfig:

```
"extends": "jsii/tsconfig.strict.json"
```

We should support:
- `jsii/tsconfig.strict.json`
- `jsii/tsconfig.generated.json`
- `jsii/tsconfig.minimal.json`


Example: https://www.npmjs.com/package/@tsconfig/node20