Add support for math.near_equal or similar to Mathf.Approximately

[xoofx]

There is currently no helper methods exposed to compare two floating points that are approximately the same

What needs to be determined:

• name of these methods (e.g near_equal...)
• what kind of implementation do we want? (taking into account ULP or not? one version with more parameters?...)

[unpacklo]

Worth looking into for our solution: https://github.com/apple/swift-evolution/blob/master/proposals/0259-approximately-equal.md

[tony-topper]

Did this go anywhere?