[dynamo][refactor] Collect dict like variable building in one place

[anijain2305]

Stack from ghstack (oldest at bottom):

• [dynamo][dicts] Remove special casing for SUPPORTED_NODES and sys.modules #144062
• -> [dynamo][refactor] Collect dict like variable building in one place #144061
• [dynamo][dicts] Guarding lazily on dict keys #143997
• [dynamo][lazy] LazyVT utils to get original value/source and is_hashable #144160
• [dynamo][easy] Move symnode helpers to utils #144158
• [dynamo][easy] Miscellaneous fixes #144141
• [dynamo][easy] Minor fixes in guards.cpp #144130
• [dynamo] remove inline inbuilt tests as flag is enabled by default #144129

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