[2.x] Intercept toContain to handle callables on collections

[gehrisandro]

Q	A
Bug fix?	no
New feature?	yes

This PR intercepts the toContain for \Illuminate\Support\Collection to handle callables.

With this PR the following gets simplified:

// Before
expect(collect(['foo', 'bar']))
    ->contains(fn ($value) => $value === 'foo')->toBeTrue()
    ->contains(fn ($value) => $value === 'baz')->toBeFalse();

// After
expect(collect(['foo', 'bar']))
    ->toContain(fn ($value) => $value === 'foo')
    ->not->toContain(fn ($value) => $value === 'baz');

Under the hood it uses the contains function on the \Illuminate\Support\Collection.

If the expected value is NOT a callable it defaults back to the original toContain expectation.

[nunomaduro]

No plans for this, thanks for your contribution!