huh.ThemeBase and other theme functions should accept a renderer for use in Wish

Is your feature request related to a problem? Please describe. The current method for passing the Wish renderer to the various styles in huh is clunky, in that you call one of the theme functions (like huh.ThemeBase()), then go back and replace the renderer anywhere there are colors, as shown: https://github.com/charmbracelet/huh/blob/dad719087fe0db3f002e02328936e12b55733379/examples/ssh-form/main.go#L78-L93

In addition to being awkward, it also means that any new styles added to huh must be added to the code that calls ThemeBase() and then swaps out styles.

Describe the solution you'd like A new set of functions that accept a renderer should be added (huh.ThemeBaseWithRenderer(), huh.ThemeCharmWithRenderer, etc), and then the current functions can simply pass lipgloss.DefaultRenderer() to the new functions, such as:

func ThemeBase() *Theme {
    return ThemeBaseWithRenderer(lipgloss.DefaultRenderer())
}

func ThemeBaseWithRenderer(renderer *lipgloss.Renderer) *Theme {
    var t Theme

    t.FieldSeparator = renderer.NewStyle().SetString("\n\n")

    button := renderer.NewStyle().
        Padding(buttonPaddingVertical, buttonPaddingHorizontal).
        MarginRight(1)

    // Focused styles.
    t.Focused.Base = renderer.NewStyle().PaddingLeft(1).BorderStyle(lipgloss.ThickBorder()).BorderLeft(true)
    t.Focused.Card = renderer.NewStyle().PaddingLeft(1)
    t.Focused.ErrorIndicator = renderer.NewStyle().SetString(" *")
    t.Focused.ErrorMessage = renderer.NewStyle().SetString(" *")
    t.Focused.SelectSelector = renderer.NewStyle().SetString("> ")
    t.Focused.NextIndicator = renderer.NewStyle().MarginLeft(1).SetString("→")
    t.Focused.PrevIndicator = renderer.NewStyle().MarginRight(1).SetString("←")
    t.Focused.MultiSelectSelector = renderer.NewStyle().SetString("> ")
    t.Focused.SelectedPrefix = renderer.NewStyle().SetString("[•] ")
    t.Focused.UnselectedPrefix = renderer.NewStyle().SetString("[ ] ")
    t.Focused.FocusedButton = button.Foreground(lipgloss.Color("0")).Background(lipgloss.Color("7"))
    t.Focused.BlurredButton = button.Foreground(lipgloss.Color("7")).Background(lipgloss.Color("0"))
    t.Focused.TextInput.Placeholder = renderer.NewStyle().Foreground(lipgloss.Color("8"))

    t.Help = help.New().Styles

    // Blurred styles.
    t.Blurred = t.Focused
    t.Blurred.Base = t.Blurred.Base.BorderStyle(lipgloss.HiddenBorder())
    t.Blurred.MultiSelectSelector = renderer.NewStyle().SetString("  ")
    t.Blurred.NextIndicator = renderer.NewStyle()
    t.Blurred.PrevIndicator = renderer.NewStyle()

    return &t
}

charmbracelet / huh

huh.ThemeBase and other theme functions should accept a renderer for use in Wish #320