No commissioner handling for discriminator collisions

[msandstedt]

Problem

Commissionable node discriminators are 12-bit, meaning that collisions will occur and must be handled. Certainty in location of the intended commissionee depends upon successful PASE connection, as this verifies that both peers hold the same shared secret.

Proposed Solution

A plausible discovery algorithm could collect discovered commisisonee candidates with matching discriminators, and then try PASE to each in turn. This algorithm is also easily extended to attempting connection via more than one resolved IP address for a given candidate.

The proposed design in #13294 does both of these things.

[msandstedt]

CC @cecille , @tcarmelveilleux , @pan-apple

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