wasm: Implement emulated stack

All non-temporary locals will now use stack memory.
When `airAlloc` is called, we create a new local, move the stack pointer,
and write its offset into the local. Arguments act as a register and do not
use any stack space.

We no longer use offsets for binary operations, but instead write the result
into a local. In this case, the local is simply used as a register, and does not
require stack space. This allows us to ensure the order of instructions is correct,
and we no longer require any patching/inserting at a specific offset.

print_air was missing the logic to print the type of a `ty_str`.

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