dev: move python hints to a dedicate module

[ClementWalter]

Why

Currently, python hint implementation are just python code in a plain text variable. This prevents benefitting from all the features required when developing (IDE, testing).

What

Create a hint module where each function is actually a hint.
Use import_lib and inspect to get the body of each function as a hint registered with the function name

Tasks

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1. put the hints in hints.py next to compiler.py
2. rewrite the existing hints in cairo/src/utils/compiler.py as proper functions of variables
3. in implement_hints, use inspect to get the body of the function

            exec_locals["memory"] = memory = self.validated_memory
            exec_locals["ap"] = ap = self.run_context.ap
            exec_locals["fp"] = fp = self.run_context.fp
            exec_locals["pc"] = pc = self.run_context.pc
            exec_locals["current_step"] = self.current_step
            exec_locals["ids"] = hint.consts(pc, ap, fp, memory)

            exec_locals["vm_load_program"] = self.load_program
            exec_locals["vm_enter_scope"] = self.enter_scope
            exec_locals["vm_exit_scope"] = self.exit_scope
            exec_locals.update(self.static_locals)
            exec_locals["builtin_runners"] = self.builtin_runners
            exec_locals.update(self.builtin_runners)

CairoHint(
    accessible_scopes=hint_.accessible_scopes,
    flow_tracking_data=hint_.flow_tracking_data,
    code=inspect(hints).get(hint_.code).get_body(),
)