Improve inlayHints colors

[shenghui0779]

• Theme Gruvbox Light

• Theme Atom One Light

[shenghui0779]

This is my custom color:

{
    "workbench.colorCustomizations": {
        "[Gruvbox Light Hard]": {
            "editorInlayHint.foreground": "#999999",
            "editorInlayHint.background": "#00000000",
            "editorInlayHint.typeForeground": "#999999",
            "editorInlayHint.typeBackground": "#00000000",
            "editorInlayHint.parameterForeground": "#999999",
            "editorInlayHint.parameterBackground": "#00000000"
        }
    }
}