allow to use custom func for get ip from request

[mr-linch]

Allow to modify default behavior of IP extraction from http.Request.

e.g. using use Cf-Connection-Ip

webhook := tgb.NewWebhook(
	handler,
	client,
	"https://example.com/webhook",
	tgb.WithWebhookRequestIP(func(r *http.Request) string {
		ip := r.Header.Get("Cf-Connecting-Ip")

		if ip != "" {
			return ip
		}

		return tgb.DefaultWebhookRequestIP(r)
	}),
)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (114f0b5) 93.15% compared to head (6f82339) 93.17%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #133      +/-   ##
==========================================
+ Coverage   93.15%   93.17%   +0.01%     
==========================================
  Files          20       20              
  Lines        2426     2432       +6     
==========================================
+ Hits         2260     2266       +6     
  Misses        130      130              
  Partials       36       36              

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