BLE: update doxygen exclusion pattern

BLE: Move cordio implementation include into source folder

BLE: Cleanup BLEInstanceBas implementation

BLE: Cleanup AttServerMessage implementation

BLE: Remove cordio namespace

BLE: Cleanup PalSigningEventMonitor.

BLE: Cleanup pal generic access service

BLE: cleanup PalEvent queue and implementation

BLE: Cleanup pal security manager

BLE: Cleanup pal Gap

BLE: Move GattServer implementation from generic to cordio

BLE: Cleanup of pal AttClient and GattClient ...

Fix interface namespace being not used.
Move generic AttClient to GattClient adapter back into the  pal

BLE: cleanup generic sources

BLE: Move source/DiscoveredCharacteristic into source/gatt/DiscoveredCharacteristic

BLE: move source/impl into source/cordio

BLE: Cleanup public headers

BLE: Clang tidy on public headers.

BLE: Expose HCI driver in public API.

BLE: Move Cordio implementation in source/impl

BLE: Move generic lib file into source/generic .

BLE: Move cordio_stack out of TARGET_CORDIO

BLE: Fix address copy in Nordic HCI driver.

BLE: Add compatibility path for headers.

BLE: Move GATT public header into ble/gatt ...

Move private headers GattServerEvents.h, GapEvents,h and GapType.h in relevant part of the source tree.

BLE: Move common publi headers into ble/common

BLE: Move gap public header at the root.

BLE: move PAL headers into source/pal

BLE: Move BleInstanceBase.h into source.

BLE: Move SecurityDB related files into generic sources

BLE: Move generic implementation and headers into source/generic