Add support for testing pipes

[NetanelBasal]

const createPipe = createPipeFactory({
  pipe: MyPipe,
  // ...
});

it('should ...', () => {
  const pipe = createPipe(`'foo' | myPipe`)
});

it('should ...', () => {
  const pipe = createPipe(`foo | myPipe`, {
    hostProps: { foo: 'lorem' }
  });
});

• it should work with a host component
• it should accept a custom host component
• it should accept host props
• it should accept provider overrides

[kanafghan]

I could try to provide a PR :-)

[NetanelBasal]

Go for it :)