WIP: Implement a step command via agent debugging

[hexploitable]

This is an attempt to add a step feature to the existing agent based breakpoint functionality (:db), by calculating the next instruction and setting an ephemeral breakpoint there.

I tried to have the code automatically continue, but the app behaves weird. Some times it would work and sometimes hang, so unless you have ideas, we'd use this like so:

> :db 0xdeadbeef

breakpoint 0xdeadbeef hit

> :ds
Setting breakpoint to 0x...

> :dc

[trufae]

Frida 18 will add support for breakpoints and watchpoints. maybe better to wait for this thing

[trufae]

the breakpoints commands should be reworked and use this pr as inspiration #630

[trufae]

breakpoints reworked, please resolve conflicts and rebase