extmod/modbluetooth: Add support for changing the GAP device name. #6019
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The GAP device name of a BLE device is currently hard-coded. This PR allows the user to dynamically set/get the GAP device name used by service 0x1800, characteristic 0x2a00. The usage is:
This name appears, for example, when a phone reads characteristic 0x2a00 of a peripheral that it scans/connects to.
The name can be any string of bytes (including an interior null byte on the BTstack implementation), although the BLE spec specifies it should be UTF-8.
Docs and test are included here.