[riot-notifications] [RIOT-OS/RIOT] sys/nimble_autoadv: add new module (#13425)

[Hendrik van Essen]

@HendrikVE commented on this pull request.



> + *                  - General discoverable mode (BLE_GAP_DISC_MODE_GEN)
+ *                  - Undirected connectable mode (BLE_GAP_CONN_MODE_UND)
+ *                  - No expiration (BLE_HS_FOREVER)
+ *                  - No name

>From these four settings only the name is adjustable right now by setting `NIMBLE_AUTOADV_DEVICE_NAME`. The idea behind this module is to provide a builtin solution for a recurring pattern of advertising a device for an application. 

(1) application starts running -> start advertising
(2) device gets connected -> stop advertising
(3) device gets disconnected -> back to (1) (restart advertising)

So between (3) and (2) advertising shouldn't stop at any time, therefore expiration is fixed to `BLE_HS_FOREVER`.

It should be discoverable (`BLE_GAP_DISC_MODE_GEN` which means `"The general discoverable mode shall be used by devices that need to be discoverable continuously or for no specific condition."`).
Non of the alternatives fits here:
- `BLE_GAP_DISC_MODE_NON` -> not discoverable
- `BLE_GAP_DISC_MODE_LTD` -> discoverable only for short time

All devices should be able to connect to it (`BLE_GAP_CONN_MODE_UND`).
Non of the alternatives fits here:
- `BLE_GAP_CONN_MODE_NON` -> not connectable
- `BLE_GAP_CONN_MODE_DIR` -> used for "fast reconnect" to specific device

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