support for the Amber model, including checkpoints #1582

Job	Run time
Code Checks	1m 51s
Compatibility Checks (3.9)	10m 27s
Notebook Checks (ARENA_Content)	2m 58s
Compatibility Checks (3.10)	11m 7s
Notebook Checks (BERT)	5m 41s
Notebook Checks (Exploratory_Analysis_Demo)	7m 3s
Notebook Checks (Interactive_Neuroscope)	2m 52s
Notebook Checks (Main_Demo)	3m 27s
Notebook Checks (Othello_GPT)	2m 35s
Notebook Checks (Patchscopes_Generation_Demo)	8m 22s
Build Docs	0s
Deploy Docs	0s
	56m 23s

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