Add integration test header_curl

integration/hurl/tests_ok/headers_curl.out

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+curl 'http://localhost:8000/default-headers'
+curl --header 'User-Agent: hurl/1.0' --header 'Host: localhost:8000' 'http://localhost:8000/default-headers'
+curl --header 'User-Agent: hurl/1.0' --header 'Host: localhost:8000' 'http://localhost:8000/default-headers'
+curl --header 'Fruit: Raspberry' --header 'Fruit: Apple' --header 'Fruit: Banana' --header 'Fruit: Grape' --header 'Color: Green' 'http://localhost:8000/custom-headers'
+curl --header 'Fruit: Raspberry' --header 'Fruit: Apple' --header 'Fruit: Banana' --header 'Fruit: Grape' --header 'Color: Green' 'http://localhost:8000/custom-headers'
+curl --header 'Beverage: café' 'http://localhost:8000/custom-headers-utf8'
+curl --header 'Id: #123' 'http://localhost:8000/custom-headers-value'
+curl --header $'Header1: \'' 'http://localhost:8000/custom-headers-quote'
+curl 'http://localhost:8000/response-headers'
+curl --header 'Empty-Header;' 'http://localhost:8000/empty-headers'

integration/hurl/tests_ok/headers_curl.ps1

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+Set-StrictMode -Version latest
+$ErrorActionPreference = 'Stop'
+hurl --verbose --no-output --curl build/headers.curl tests_ok/headers.hurl
+
+Write-Host (Get-Content build/headers.curl -Raw) -NoNewLine

integration/hurl/tests_ok/headers_curl.sh

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+#!/bin/bash
+set -Eeuo pipefail
+hurl --verbose --no-output --curl build/headers.curl tests_ok/headers.hurl
+
+cat build/headers.curl