Split Sail->ANF translation into its own file

Refactor the C compilation process by moving out the conversion to
A-normal form into its own file. Also make the A-normal form AST
parameterised by the type of the types annotating it. The idea being we
can have a typ aexp -> ctyp aexp translation, converting to low-level
types at a slightly higher level before mapping into our low-level IR.
This would fix some issues we have where the type of variables change
due to flow typing, because we could map the sail types to low-level
types in the ANF ast where we still have some knowledge about the
structure of the original Sail.

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