feat(esp_http_server): Dynamically allocate http server's scratch buffer

In this commit, esp_http_server's http_parser scratch is made dynamic.
User is asked to give limit size for header and URI, according to which
scratch buufer allocates memory upto limits

examples/protocols/https_server/simple/main/main.c

@@ -44,7 +44,6 @@ static esp_err_t root_get_handler(httpd_req_t *req)
 {
     httpd_resp_set_type(req, "text/html");
     httpd_resp_send(req, "<h1>Hello Secure World!</h1>", HTTPD_RESP_USE_STRLEN);
-
     return ESP_OK;
 }