some sub-types and constants applicable to GapAdvertisingParams could be extracted to BLEProtocol.h

`AdvertisingType_t` can encapsulated into a struct and possibly be moved.
we can create types for advertising interval and timeout.
constants defining min and max for the interval and timeout could be extracted.

Start by inspecting GapAdvertisingParams, AdvertisingType_t, and BLEProtocol.h to understand their current relationships. Determine whether the advertising interval and timeout types and their minimum and maximum constants belong in BLEProtocol.h, then verify that the existing API remains consistent after the extraction.

Written by the indexing model from the issue text.