experimental: allow pasting svg as html embed (for now)

[TrySound]

Now icons are added as HtmlEmbed component when paste html. This is essential for tailwind paste which use a lot of icons.

    <div
      style="display: flex; border: 1px solid #ccc; border-radius: 5px; overflow: hidden;"
    >
      <button
        style="background-color: #f8f8f8; border: none; padding: 10px; cursor: pointer; display: flex; align-items: center; justify-content: center; border-right: 1px solid #ccc; font-family: sans-serif; font-size: 12px;"
      >
        <svg
          xmlns="http://www.w3.org/2000/svg"
          width="24"
          height="24"
          viewBox="0 0 24 24"
          fill="none"
          stroke="currentColor"
          stroke-width="2"
          stroke-linecap="round"
          stroke-linejoin="round"
          style="margin-right: 5px;"
        >
          <line x1="3" y1="12" x2="21" y2="12"></line>
          <line x1="3" y1="6" x2="21" y2="6"></line>
          <line x1="3" y1="18" x2="21" y2="18"></line>
        </svg>
        <span>Menu</span>
      </button>
      <button
        style="background-color: #f8f8f8; border: none; padding: 10px; cursor: pointer; display: flex; align-items: center; justify-content: center; border-right: 1px solid #ccc; font-family: sans-serif; font-size: 12px;"
      >
        <svg
          xmlns="http://www.w3.org/2000/svg"
          width="24"
          height="24"
          viewBox="0 0 24 24"
          fill="none"
          stroke="currentColor"
          stroke-width="2"
          stroke-linecap="round"
          stroke-linejoin="round"
          style="margin-right: 5px;"
        >
          <circle cx="12" cy="12" r="10"></circle>
          <line x1="12" y1="8" x2="12" y2="16"></line>
          <line x1="8" y1="12" x2="16" y2="12"></line>
        </svg>
        <span>Add</span>
      </button>
      <button
        style="background-color: #f8f8f8; border: none; padding: 10px; cursor: pointer; display: flex; align-items: center; justify-content: center; font-family: sans-serif; font-size: 12px;"
      >
        <svg
          xmlns="http://www.w3.org/2000/svg"
          width="24"
          height="24"
          viewBox="0 0 24 24"
          fill="none"
          stroke="currentColor"
          stroke-width="2"
          stroke-linecap="round"
          stroke-linejoin="round"
          style="margin-right: 5px;"
        >
          <path d="M18 6L6 18"></path>
          <path d="M6 6L18 18"></path>
        </svg>
        <span>Close</span>
      </button>
    </div>