executor: introduce __addrspace_guest

Apply __addrspace_guest to every guest function and use a C++ template
to statically validate that host functions are not passed to
executor_fn_guest_addr().
This only works in Clang builds of syz-executor, because GCC does not
support address spaces, and C reproducers cannot use templates.

The static check allows us to drop the dynamic checks in DEFINE_GUEST_FN_TO_GPA_FN().
While at it, replace DEFINE_GUEST_FN_TO_GPA_FN() with explicit declarations of
host_fn_guest_addr() and guest_fn_guest_addr().

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