arch: x86: implement `arch_stack_walk()`

Currently it supports `esf` based unwinding only.

Then, update the exception stack unwinding to use
`arch_stack_walk()`, and update the Kconfigs & testcase
accordingly.

Signed-off-by: Yong Cong Sin <ycsin@meta.com>
Signed-off-by: Yong Cong Sin <yongcong.sin@gmail.com>