[Enhancement]: Add Handler for favicon.ico

[0SkillAllLuck]

Description

Most browsers and other tools expect a favicon to be present on /favicon.ico. To help with this behaviour a utility function to simplify the registration of that endpoint. Optionally a automatic conversion from PNG/JPEG or other image formats to ICO might be a good thing to have.

Additional Context

No response

Code Snippet

package main

import "github.com/go-mojito/mojito"
import "github.com/go-mojito/mojito/handler"

func main() {
  mojito.GET("/", func(ctx mojito.Context) {
    ctx.String("Hello World")
  })
  handler.HandleFavicon()
  mojito.ListenAndServe(":8123")
}

Checklist:

• I agree to follow Mojito's Code of Conduct.
• I have checked for existing issues that describe my suggestion prior to opening this one.
• I understand that improperly formatted feature requests reports may be closed without explanation.