chore: create lspsaga highlights

[mikesmithgh]

-- lspsaga.nvim LspSagaCodeActionTitle = { link = "Title" }, LspSagaCodeActionBorder = { link = "GruvboxFg1" }, LspSagaCodeActionContent = { fg = colors.green, bold = config.bold }, LspSagaLspFinderBorder = { link = "GruvboxFg1" }, LspSagaAutoPreview = { link = "GruvboxOrange" }, TargetWord = { fg = colors.blue, bold = config.bold }, FinderSeparator = { link = "GruvboxAqua" }, LspSagaDefPreviewBorder = { link = "GruvboxBlue" }, LspSagaHoverBorder = { link = "GruvboxOrange" }, LspSagaRenameBorder = { link = "GruvboxBlue" }, LspSagaDiagnosticSource = { link = "GruvboxOrange" }, LspSagaDiagnosticBorder = { link = "GruvboxPurple" }, LspSagaDiagnosticHeader = { link = "GruvboxGreen" }, LspSagaSignatureHelpBorder = { link = "GruvboxGreen" }, SagaShadow = { link = "GruvboxBg0" },