Ability to return json depicting symbol relationships

[jpuzz0]

The dot_parser sample in this repo is as follows:

digraph G {
  rankdir="LR"
  "__x64_sys_getpid"->"__task_pid_nr_ns" 
  "__task_pid_nr_ns"->"__rcu_read_lock" 
  "__task_pid_nr_ns"->"__rcu_read_unlock" 
}

When consuming data in a javascript application, it would be useful to be able to retrieve in json format, specifically as a dictionary like the following:

{
  "__x64_sys_getpid": ["__task_pid_nr_ns"],
  "__task_pid_nr_ns": ["__rcu_read_lock", "__rcu_read_unlock" ]
}

Where if a symbol has no target symbols, its value would be an empty array.

[jpuzz0]

Alternatively, we could have something like the following to avoid having empty arrays assigned to keys:

Alternative 1

[
  { name: "test1" },
  { name: "test2" },
  { name: "test3" },
  { name: "test4", targets: ["test1", "test2"] },
  { name: "test5", targets: ["test3"] },
]

or

Alternative 2

[
  "test1",
  "test2",
  "test3",
  { name: "test4", targets: ["test1", "test2"] },
  { name: "test5", targets: ["test3"] })
]

Any of these formats would work for the frontend.

For what it's worth, of all 3 proposed solutions, I think Alternative 1 is what I'd prefer.