tests: add CGContext graphics state tests - #33
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Adds a gnustep-tests suite for CGContext graphics state under Tests/opal, checking the CTM of a bitmap context (identity initially, and after translate and scale), that saving and restoring the graphics state restores the CTM, that clipping confines a fill to the clip rect (sampling a pixel inside and outside), and that a global alpha premultiplies the fill. Expected values were checked against Apple CoreGraphics on a macOS runner. All checks pass; no divergences found.