feat(toggle): add more M.wk fields for better user customization (#4521)

## Description
Add to `M.wk` fields for `icon`, `color_enabled` and `color_disabled`
for more granual user customization.
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maintainers
  why we should accept this pull request. -->

## Related Issue(s)
No, rather a discussion #4512
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  If this PR fixes any issues, please link to the issue here.
  - Fixes #<issue_number>
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## Screenshots

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## Checklist

- [x] I've read the
[CONTRIBUTING](https://github.com/LazyVim/LazyVim/blob/main/CONTRIBUTING.md)
guidelines.

lua/lazyvim/util/toggle.lua

@@ -3,6 +3,9 @@ local M = {}
 
 ---@class lazyvim.Toggle
 ---@field name string
+---@field icon? string
+---@field color_enabled? string
+---@field color_disabled? string
 ---@field get fun():boolean
 ---@field set fun(state:boolean)
 
@@ -50,7 +53,8 @@ function M.wk(lhs, toggle)
     {
       lhs,
       icon = function()
-        return safe_get() and { icon = " ", color = "green" } or { icon = " ", color = "yellow" }
+        return safe_get() and { icon = toggle.icon or " ", color = toggle.color_enabled or "green" }
+          or { icon = toggle.icon or " ", color = toggle.color_disabled or "yellow" }
       end,
       desc = function()
         return (safe_get() and "Disable " or "Enable ") .. toggle.name