nims: add get connection(s) with multiplexer APIs to accommodate mux info #1713

Job	Run time
Run CI / Check NIMS / Check NIMS	1m 18s
Run CI / Check NIMG / Check NIMG	29s
Run CI / Check examples / Check examples	1m 4s
Run CI / Run unit tests / Run unit tests (windows-latest, 3.8)	2m 44s
Run CI / Run unit tests / Run unit tests (windows-latest, 3.9)	2m 38s
Run CI / Run unit tests / Run unit tests (windows-latest, 3.10)	2m 32s
Run CI / Run unit tests / Run unit tests (windows-latest, 3.11)	2m 27s
Run CI / Run unit tests / Run unit tests (windows-latest, 3.12)	3m 52s
Run CI / Run unit tests / Run unit tests (ubuntu-latest, 3.8)	1m 43s
Run CI / Run unit tests / Run unit tests (ubuntu-latest, 3.9)	1m 43s
Run CI / Run unit tests / Run unit tests (ubuntu-latest, 3.10)	1m 36s
Run CI / Run unit tests / Run unit tests (ubuntu-latest, 3.11)	2m 9s
Run CI / Run unit tests / Run unit tests (ubuntu-latest, 3.12)	2m 42s
Run CI / Run system tests / Run system tests (py32)	23m 12s
Run CI / Run system tests / Run system tests (py64)	15m 33s
Run CI / Report test results / Report test results	10s
	1h 5m 52s

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