Add a panel accessor class for streamlit scripts to call #102

Job	Run time
Run CI / Check docs / Check docs	37s
Run CI / Check nipanel / Check nipanel	50s
Run CI / Run unit tests / Run unit tests (windows-latest, 3.10)	53s
Run CI / Run unit tests / Run unit tests (ubuntu-latest, 3.10)	29s
Run CI / Run unit tests / Run unit tests (ubuntu-latest, 3.9)	31s
Run CI / Run unit tests / Run unit tests (windows-latest, 3.11)	1m 13s
Run CI / Run unit tests / Run unit tests (windows-latest, 3.9)	56s
Run CI / Run unit tests / Run unit tests (windows-latest, 3.12)	59s
Run CI / Run unit tests / Run unit tests (ubuntu-latest, 3.13)	6m 41s
Run CI / Run unit tests / Run unit tests (ubuntu-latest, 3.11)	24s
Run CI / Run unit tests / Run unit tests (ubuntu-latest, 3.12)	28s
Run CI / Run unit tests / Run unit tests (windows-latest, 3.13)	9m 38s
Run CI / Report test results / Report test results	22s
	24m 1s

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