able to override which plugin to use

[unional]

Plugins can only check if it supports a particular subject by its shape.

Most of the time this should be ok.

But there might be cases that certain plugin falsely claim support of a subject by mistake.

User should be able to specify which plugin to use directly in those cases:

test('...', () => {
  const spec = kd('...')

  // `another-plugin` must be already loaded in `mocktomata.json`
  // this only override the order as there might be another plugin falsely claim support
  // before the one user wants (in this specific case)
  const mock = spec(subject, { plugin: 'another-plugin' })
}