ports/nrf: bluetooth module implementation

[yasnim24]

Hello,

i've implemented a bluetooth module for the nRF port.

As I have now discovered there is already a pull request #8318
"nrf/bluetooth: Add support for nimble based ubluetooth."

I don't want to compete with that but if the community is interested I could pull that implementation.

Background

I already has developed an application based on aioble and therefore the bluetooth module. This application was running on the Unix port successfully. Now I wanted to run that application on the "Arduino nano 33 BLE" board.
Soon I realized that the nRF port has an ubluepy but no bluetooth module.

Therefore I decided to implement an bluetooth module which I could use for the "Arduino nano 33 BLE" board.

Implemented features

The following features are implemented and rudimentary tested with the "Arduino nano 33 BLE" board:

• Observer Role (Scanner)
• Central Role
• GATT Client
• Pairing and bonding in the Central Role; based on several components from the nRF SDK

The following features are potentially implemented but not tested:

• Broadcaster Role (Advertiser)
• Peripheral Role
• GATT Server
• Pairing and bonding in the Peripheral Role; based on several components from the nRF SDK