feat: add pair and unpair support

[erisu]

Resolves #4
Resolves #5

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This PR adds support for pair and unpair.

A successful results would look like this:

{
  status: 0,
  signal: null,
  output: [ null, <Buffer >, <Buffer > ],
  pid: 111,
  stdout: <Buffer >,
  stderr: <Buffer >
}

When pairing is successfully and the stdout was converted to a string, we would see the pair UUID.

Note: The string will contain a trailing newline \n.