Generate index.ts file to expose everything to client handlers

# Why do we need this
- Better autocompletion. VSCode not always find import symbol in package if exported symbol is not re-exported from entry-point. For example try to import `createSerialOperation` from deeplinks :)
- Ability to expose everything to client handler ( a little help to https://github.com/deep-foundation/deepcase/issues/63 )
I have imported and logged Deepcase imports in client handler:
```
const DeepCase = await deep.import('@deep-foundation/deepcase');
console.log("My"+"Log", {DeepCase})
```
and now there is a lot of thing to use!