Escape Raw Brackets In Request URLs

[Ameston]

Malformed HTTP requests that leverage raw brackets in the request URL are not handled correctly by the library. For example:

req1, err := http.NewRequest("GET", "https://example.com/[", nil)
	if err != nil {
		log.Fatalf("Failed to create request: %v", err)
	}
	req1.Header.Add("User-Agent", "test-agent")
	req1.Header.Add("Accept", "*/*")
	
	command1, err := http2curl.GetCurlCommand(req1)
	if err != nil {
		log.Fatalf("Failed to generate curl command: %v", err)
	}
	fmt.Printf("Test 1 - Basic request with brackets:\n%s\n\n", command1)

This results in the following cURL command:

curl -k -X 'GET' -H 'Accept: */*' -H 'User-Agent: test-agent' 'https://example.com/[' --compressed

Which results in a syntax error when run:

curl: (3) bad range specification in URL position 22:
https://example.com/[

This PR resolves this issue by escaping brackets in the URLs of HTTP requests.