move indexed => functional_types [in progress]

[sritchie]

Some thoughts here:

• I can't kill Indexed now because some folks (SaferData) are using it for their choicemaps.
• I want it to be that we can are left with a tree of Indexed and Or, with basically anything at the leaves. And I think I want to make sure that the shapes match if someone provides a non-Sparse...
• the key here is implementing __getitem__ on this structure, so that when you call __getitem__ you descend down into the Indexed or Or layers until you hit a NON-Sparse. At that point you should
  • tree-map the selection down to the bottom
  • is_leaf should block at Mask, since we know those are handled carefully
• to MAKE these things I want to have extend create a sequence of Indexed, and then Or can | them together
• choicemap, when the builder receives dynamic addresses, should build one of these things
• fetching should query down into one of these things (__call__ syntax on the choicemap)

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src/genjax/_src/core/generative/choice_map.py

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src/genjax/_src/core/generative/functional_types.py

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