new rules: prefer-toBeNull / prefer-toBeTrue / prefer-toBeFalse

[rklec]

Is your feature request related to a problem? Please describe.

Incorrect code should be:

expect(value).toBe(null);
expect(value).toBe(null, 'with an explanation');

Describe the solution you'd like

It should sugest a correction to

expect(value).toBeNull();
expect(value).toBeNull('with an explanation');

This exists since jasmine v1.3.0.

Describe alternatives you've considered

A clear and concise description of any alternative solutions or features you've considered

Additional context
The same may be done with toBeTrue()/toBeFalse().

These are all very similar to prefer-toBeUndefined and can easily be auto-fixed.