fix(BLE): Feat to allow advertising updates while advertising

[EdwinFairchild]

Description

(nothing critical here that needs to be merged before September release)
Allows the update of advertising data on the fly, per use case of customers, and the project our interns worked on.
Low leve function that does the ultimate updating is protected in critical section guards so I do not see updating on the fly as an issue, Nordics SDK does the same.

TODO

I will write some documentation (separate PR) on this to the user guide since updating on the fly needs a specific workflow.

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