[mlir] Split MLProgram global load and store to Graph variants

* Split ops into X_graph variants as discussed;
* Remove tokens from non-Graph region variants and rely on side-effect
  modelling there while removing side-effect modelling from Graph
  variants and relying on explicit ordering there;
* Make tokens required to be produced by Graph variants - but kept
  explicit token type specification given previous discussion on this
  potentially being configurable in future;

This results in duplicating some code. I considered adding helper
functions but decided against adding an abstraction there early given
size of duplication and creating accidental coupling.

Differential Revision: https://reviews.llvm.org/D127813

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