Add method to mdoc API to get handle the native DeviceRequest and DeviceResponse

[TimoGlastra]

• Get credentials for request
• Select crednetials for request
• Create device response

This can be used in combination with https://github.com/animo/expo-mdoc-data-transfer to have easy proxmity flow.

Basically you:

• Initialize bluetooth connection using data transfer lib
• handle request, find credentials
• show credentials to user. optionally let user select
• create device response
• send it using the data transfer lib

We could optionally incorporate the mdoc-data-transfer lib as an optional peer dependency to make it even easier, but even then it's nice to have support for the native mDOC request/response handling