Add .BeCloseTo()/.NotBeCloseTo() to TimeOnlyAssertions and DateOnlyAssertions

[jhartmann123]

Description

Similar to the DateTimeAssertions, the method BeCloseTo() should be available for TimeOnly and DateOnly.

E.g.

// Arrange
SetTime("10:00:12");
var expected = new TimeOnly(10, 0, 12);

// Act
TimeOnly time = GetTime();

// Assert
result.Should().BeCloseTo(expected, TimeSpan.FromSeconds(1));

Expected behavior:

Validation, if the variable expected is >= 10:00:11 and <= 10:00:13

[jnyrup]

We intentionally left them out from DateOnly as you cannot measure the time difference between two dates.

But I think it makes sense to add it for TimeOnly.