Extend ZEN_EXPECT with composable EQ, GT, LT, etc.

[heinsaar]

This will allow expressions like:

ZEN_EXPECT(EQ(x, 4));
ZEN_EXPECT(IS_TRUE(expr));
ZEN_EXPECT(AND(GT(x, 0), LT(x, 10)));

Without sacrificing the simplicity of ZEN_EXPECT(expression) for the most common cases as well as staying backward compatible.

Other benefits of these constructs should be the ability to see the exact value of x at failure; for floating-point comparisons, and other special cases, specialized macros can provide tailored behavior that a universal macro cannot. For example, EXPECT_FLOAT_EQ and EXPECT_DOUBLE_EQ take into account the precision issues inherent in floating-point arithmetic, offering a more appropriate comparison than a straightforward equality check, and maybe more.

Use this advice as a starting point.

[Sudhanva21]

Can you please assign me this issue, sir? I am interested in solving this
@heinsaar

[heinsaar]

@Sudhanva21 Sure, assigned. Looking forward to the implementation.

[Sudhanva21]

Sir, I have added an argument in ZEN_EXPECT to log the value when it fails, as you mentioned in the issue.
So whenever the macro is used it should contain 2 arguments instead of one.

I have made the changes accordingly. Please review it. Committed the changes in same branch