Include accuracy for point and size transformation checks

[marcprux]

The TestAffineTransform.testInversion case was failing for me on macOS 13.3 with:

TestAffineTransform.swift:692: error: -[SkipFoundationTests.TestAffineTransform testInversion] : XCTAssertEqual failed: ("(10.0, 10.000000000000002)") is not equal to ("(9.999999999999998, 10.000000000000002)") - Expected NSAffineTransform to match AffineTransform's point-accepting transform(_:)

TestAffineTransform.swift:692: error: -[SkipFoundationTests.TestAffineTransform testInversion] : XCTAssertEqual failed: ("(10.000000000000004, 10.000000000000002)") is not equal to ("(10.000000000000002, 10.000000000000002)") - Expected NSAffineTransform to match AffineTransform's size-accepting transform(_:)

This PR resolves it by including the accuracy in the XCTAssertEqual for the CGPoint and CGSize instances.

[MaxDesiatov]

@swift-ci test

[compnerd]

@swift-ci please test macOS platform