Initial implementation of extended-const proposal. (#1824)

The primary changes here are to the interpreter and how it handles
initializer expressions.  With this change we model these are normal
function that we run during module initialization.

I imagine we could optimize this further by creating one long function
and encoding the `global.set`/`memory.init`/`table.init` into the
function itself, but this change seems like a good first step to make
the current tests pass.

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