[feature] Add a pwndbg p2p command

[tesuji]

Type of feature request

Additional API

Misc

No response

Summary Description

pwndbg has a handy command named p2p (Pointer to pointer chain search) that is used to search given mapping for all pointers that point to specified mapping. For example:

pwndbg> p2p libc stack
00:0000│  0x73100cc45440 (program_invocation_short_name) —▸ 0x7ffe6347a522 ◂— 0
00:0000│  0x73100cc45448 (program_invocation_name) —▸ 0x7ffe6347a517 ◂— 0

It would be nice if gef has the same feature.

Implementation idea/suggestion

N/A.

Existing alternatives?

N/A.

Additional information

No response